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Practice of ruling dynasties marrying into other reigning families

Royal intermarriage is the practice of members of ruling dynasties marrying into other reigning families. It was more commonly done in the past as part of strategic diplomacy for national interest. Although sometimes enforced by legal requirement on persons of royal birth, more often it has been a matter of political policy or tradition in monarchies. In Europe, the practice was most prevalent from the medieval era until the outbreak of World War I, but evidence of intermarriage between royal dynasties in other parts of the world can be found as far back as the Late Bronze Age. Monarchs were often in pursuit of national and international aggrandisement on behalf of themselves and their dynasties, thus bonds of kinship tended to promote or restrain aggression. Marriage between dynasties could serve to initiate, reinforce or guarantee peace between nations. Alternatively, kinship by marriage could secure an alliance between two dynasties which sought to reduce the sense of threat from or to initiate aggression against the realm of a third dynasty.

There are a few recorded cases of intermarriage between Assyrian and Babylonian royals. According to legend, the Babylonian Semiramis was married to the Assyrian general Onnes and then to the Assyrian king Ninus, the legendary founder of Nineveh according to the Ancient Greeks. She has been equated with the historical Shammuramat, wife of Shamshi Adad V. In turn, Shammuramat has been claimed to be of Babylonian descent. In the early 9th century BC, the Babylonian king Nabu shuma ukin I (Dynasty of E) exchanged daughters in marriage with the contemporary Assyrian monarch. The Assyrian princess Muballitat Sherua, daughter of Ashur uballit I, was given in marriage to the contemporary Babylonian monarch. She was the mother of the future Babylonian king Kara hardash. Additionally, Kurigalzu II was either the son or grandson of Muballitat. Other consorts of Assyrian monarchs, such as Naqiʾa, Ešarra ḫammat, Banitu (who was perhaps brought to Assyria as a hostage after Tiglath Pileser's conquest of Babylon) might also have been of Babylonian origin.

Babylonians and Elamites engaged many times in royal intermarriage, especially in the Kassite period. It is probable that Elamites and Kassites had close ties long before the first attested royal intermarriages between them. Babylonian Kassites and Elamites intensively intermarried for a period of about 120 years, from c. 1290 to 1170 BC.

The Chakri dynasty of Thailand has included marriages between royal relatives, but marriages between dynasties and foreigners, including foreign royals, are rare. This is in part due to Section 11 of 1924 Palace Law of Succession which excludes members of the royal family from the line of succession if they marry a non Thai national. The late king Bhumibol Adulyadej was a first cousin once removed of his wife, Sirikit, the two being, respectively, a grandson and a great granddaughter of Chulalongkorn. Chulalongkorn married a number of his half sisters, including Savang Vadhana and Sunandha Kumariratana; all shared the same father, Mongkut. He also married Dara Rasmi, a princess of a vassal state.

The Lý dynasty which ruled Dai Viet (Vietnam) married its princesses off to regional rivals to establish alliances with them. One of these marriages was between a Lý empress regnant (Lý Chiêu Hoàng) and a member of fishermen turned warlords Trần clan (Trần Thái Tông) from Nam Định, which enabled the Trần to then topple the Lý and established their own Trần dynasty. A Lý princess also married into the Hồ clan faction, which later usurped power and established the Hồ dynasty after having a Tran princess marry their leader, Hồ Quý Ly.

The Cambodian King Chey Chettha II married the Vietnamese Nguyễn lord Princess Nguyễn Thị Ngọc Vạn, a daughter of Lord Nguyễn Phúc Nguyên, in 1618. In return, the king granted the Vietnamese the right to establish settlements in Mô Xoài (now Bà Rịa), in the region of Prey Nokor—which they colloquially referred to as Sài Gòn, and which later became Ho Chi Minh City.

In the Chola dynasty in southern India, Madhurantaki the daughter of Emperor Rajendra II married Kulottunga I the son the son of Eastern Chalukya ruler Rajaraja Narendra. This was to improve the relationship between the two royal houses and to straighten Chola influence in Vengai. Kulottunga and Madhurantaki were first cousins as Kulottunga's mother Amangai Devi was the sister of Rajendra II making them both the grandchildren of Emperor Rajendra I.

Marriage policy in imperial China differed from dynasty to dynasty. Several dynasties practiced Heqin, which involved marrying off princesses to other royal families. The Xiongnu practiced marriage alliances with Han dynasty officers and officials who defected to their side. The older sister of the Chanyu (the Xiongnu ruler) was married to the Xiongnu general Zhao Xin, the Marquis of Xi who was serving the Han dynasty. The daughter of the Chanyu was married to the Han Chinese general Li Ling after he surrendered and defected. The Yenisei Kirghiz Khagans claimed descent from Li Ling. Another Han Chinese general who defected to the Xiongnu was Li Guangli who also married a daughter of the Chanyu. The Xianbei Tuoba royal family of Northern Wei started to arrange for Han Chinese elites to marry daughters of the royal family in the 480s. Some Han Chinese exiled royalty fled from southern China and defected to the Xianbei. Several daughters of the Xianbei Emperor Xiaowen of Northern Wei were married to Han Chinese elites, the Han Chinese Liu Song royal Liu Hui 劉輝, married Princess Lanling 蘭陵公主 of the Northern Wei, Princess Huayang 華陽公主 to Sima Fei 司馬朏, a descendant of Jin dynasty (266–420) royalty, Princess Jinan 濟南公主 to Lu Daoqian 盧道虔, Princess Nanyang 南陽長公主 to Xiao Baoyin 蕭寶夤, a member of Southern Qi royalty. Emperor Xiaozhuang of Northern Wei's sister the Shouyang Princess was wedded to The Liang dynasty ruler Emperor Wu of Liang's son Xiao Zong 蕭綜. When the Eastern Jin dynasty ended Northern Wei received the Jin prince Sima Chuzhi 司馬楚之 as a refugee. A Northern Wei Princess married Sima Chuzhi, giving birth to Sima Jinlong. Northern Liang King Juqu Mujian's daughter married Sima Jinlong. The Rouran Khaganate arranged for one of their princesses, Khagan Yujiulü Anagui's daughter Princess Ruru 蠕蠕公主 to be married to the Han Chinese ruler Gao Huan of the Eastern Wei. The Kingdom of Gaochang was made out of Han Chinese colonists and ruled by the Han Chinese Qu family which originated from Gansu. Jincheng commandery 金城 (Lanzhou), district of Yuzhong 榆中 was the home of the Qu Jia. The Qu family was linked by marriage alliances to the Turks, with a Turk being the grandmother of King Qu Boya. Tang dynasty (618–907) emperors exchanged and the rulers of the Uyghur Khaganate exchanged princesses in marriage to consolidate the special trade and military relationship that developed after the Khaganate supported the Chinese during the An Lushan Rebellion. The Uyghur Khaganate exchanged princesses in marriage with Tang dynasty China in 756 to seal the alliance against An Lushan. The Uyghur Khagan Bayanchur Khan had his daughter Uyghur Princess Pijia (毗伽公主) married to Tang dynasty Chinese Prince Li Chengcai (李承采), Prince of Dunhuang (敦煌王), son of Li Shouli, Prince of Bin, while the Tang dynasty Chinese princess Ninguo married Uyghur Khagan Bayanchur. At least three Tang imperial princesses are known to have married khagans between 758 and 821. These unions temporarily stopped in 788, which is believed in part to be because stability within the Chinese empire meant that they were politically unnecessary; however, threats from Tibet in the west, and a renewed need for Uyghur support, precipitated the marriage of Princess Taihe to Bilge Khagan. The Chinese Cao family ruling Guiyi Circuit established marriage alliances with the Saka Kingdom of Khotan, with both the Cao rulers marrying Khotanese princesses and with Cao princesses marrying Khotanese rulers. A Khotanese princess who was the daughter of the King of Khotan married Cao Yanlu. The Khitan Liao dynasty arranged for women from the Khitan royal consort Xiao clan to marry members of the Han Chinese Han 韓 clan, which originated in Jizhou 冀州 before being abducted by the Khitan and becoming part of the Han Chinese elite of the Liao. Han Chinese Geng family intermarried with the Khitan and the Han 韓 clan provided two of their women as wives to Geng Yanyi and the second one was the mother of Geng Zhixin. Empress Rende's sister, a member of the Xiao clan, was the mother of Han Chinese General Geng Yanyi. Han Durang (Yelu Longyun) was the father of Queen dowager of State Chen, who was the wife of General Geng Yanyi and buried with him in his tomb in Zhaoyang in Liaoning. His wife was also known as "Madame Han". The Geng's tomb is located in Liaoning at Guyingzi in Chaoying. Emperors of the proceeding Song dynasty (960–1279) tended to marry from within their own borders. Tang emperors, mainly took their wives from high ranking bureaucratic families, but the Song dynasty did not consider rank important when it came to selecting their consorts. It has been estimated that only a quarter of Song consorts were from such families, with the rest being from lower status backgrounds. For example, Liu, consort of Emperor Zhenzong, had been a street performer and consort Miao, wife of Emperor Renzong was the daughter of his own wet nurse. To maintain the ethnic purity of the ruling dynasty, after the Kangxi Period (1662–1722), emperors and princes were forbidden to marry non Manchu and non Mongol wives. Imperial daughters however were not covered by this ban, and as with their preceding dynasties, were often married to Mongol princes to gain political or military support, especially in the early years of the Qing dynasty; three of the nine daughters of Emperor Nurhaci and twelve of Emperor Hongtaiji's daughters were married to Mongol princes. Aisin Gioro women were married to the sons of the Han Chinese generals Sun Sike (Sun Ssu k'o) 孫思克, Geng Jimao (Keng Chi mao), Shang Kexi (Shang K'o hsi), and Wu Sangui (Wu San kuei). Nurhaci's son Abatai's daughter was married to Li Yongfang. The offspring of Li received the "Third Class Viscount" title. Li Yongfang was the great great great grandfather of Li Shiyao 李侍堯. The "efu" 額駙 rank was given to husbands of Qing princesses. Geng Zhongming, a Han bannerman, was awarded the title of Prince Jingnan, and his son Geng Jingmao managed to have both his sons Geng Jingzhong and Geng Zhaozhong 耿昭忠 become court attendants under the Shunzhi Emperor and married Aisin Gioro women, with Prince Abatai's granddaughter marrying Geng Zhaozhong 耿昭忠 and Haoge's (a son of Hong Taiji) daughter marrying Geng Jingzhong. A daughter 和硕柔嘉公主 of the Manchu Aisin Gioro Prince Yolo 岳樂 (Prince An) was wedded to Geng Juzhong 耿聚忠 who was another son of Geng Jingmao. The fourteenth daughter of Kangxi (和硕悫靖公主) was wedded to Sun Chengen, the son (孫承恩) of Sun Sike (Sun Ssu k'o) 孫思克, a Han bannerman.

The Silla Kingdom had a practice that limited the succession to the throne to members of the seonggol, or "sacred bone", rank. To maintain their "sacred bone" rank, members of this caste often intermarried with one another in the same fashion that European royals intermarried to maintain a "pure" royal pedigree. The Goryeo dynasty had a history of incestuous marriage within the royal family in its early years, starting from Gwangjong, the fourth king, who married his half sister Queen Daemok. To avoid scandals, the female members of the dynasty would be ceremonially adopted by their maternal families after birth. This practice of dynastic incest ended with the overthrow of Queen Heonae, the mother of Mokjong, the seventh king, after she attempted to seize the throne for herself and her illegitimate sons by placing these sons as Mokjong's heir, only to be foiled by a coup masterminded by the Goryeo general Kang Cho. After the Second Manchu invasion of Korea, Joseon Korea was forced to give several of their royal princesses as concubines to the Qing Manchu regent Prince Dorgon. In 1650, Dorgon married the Korean Princess Uisun (義順). She was a collateral branch of the Korean royal family, and daughter of Yi Gae yun (李愷胤). Dorgon married two Korean princesses at Lianshan.

Though some emperors, such as Justin I and Justinian I, took low born wives, dynastic intermarriages in imperial families were not unusual in the Byzantine Empire. Following the fall of Constantinople in 1204, the ruling families, the Laskarides and then the Palaiologoi, thought it prudent to marry into foreign dynasties. One early example is the marriage of John Doukas Vatatzes with Constance, the daughter of Emperor Frederick II of the Holy Roman Empire, to seal their alliance. After establishing an alliance with the Mongols in 1263, Michael VIII Palaiologos married two of his daughters to Mongol khans to cement their agreement: his daughter Euphrosyne Palaiologina was married to Nogai Khan of the Golden Horde, and his daughter Maria Palaiologina, was married to Abaqa Khan of the Ilkhanate. Later in the century, Andronikos II Palaiologos agreed to marital alliances with Ghazan of the Ilkhanate and Toqta and Uzbeg of the Golden Horde, which were quickly followed by their marriages to his daughters. The Grand Komnenoi of the Empire of Trebizond were famed for marrying their daughters to their neighbours as acts of diplomacy. Theodora Megale Komnene, daughter of John IV, was married to Uzun Hassan, lord of the Aq Qoyunlu, to seal an alliance between the Empire and the so called White Sheep. Although the alliance failed to save Trebizond from its eventual defeat, and despite being a devout Christian in a Muslim state, Theodora did manage to exercise a pervasive influence both in the domestic and foreign actions of her husband. Their grandson Ismail I was the founder of the Safavid dynasty of Iran

Though usually made to strengthen the position of the empire, there are examples of interdynastic marriages destabilising the emperor's authority. When Emperor Andronikos II Palaiologos married his second wife, Eirene of Montferrat, in 1284 she caused a division in the Empire over her demand that her own sons share in imperial territory with, Michael, his son from his first marriage. She resorted to leaving Constantinople, the capital of the Byzantine Empire, and setting up her own court in the second city of the Empire, Thessalonica. The increase in royal intermarriage often meant that lands passed into the hands of foreign houses, when the nearest heir was the son of a native dynasty and a foreign royal. Neighbouring Muslim powers did not start to give their daughters in marriage to Ottoman princes until the fifteenth century, when they were seen to have grown in importance. This same principle meant that, while Ottoman men were free to marry Christian women, Muslim princesses were prevented from marrying Christian princes.

Royal incest was extremely common in the Kingdom of Hawaii and its predecessors, despite being rare in other Polynesian societies. Among the aliʻi, the ruling class, marriage between blood relatives of the first degree was believed to produce children with the highest rank under the kapu system, equal to that of the gods. A marriage between brother and sister was considered "the most perfect and revered union". It was believed that the mana of a particular aliʻi could be increased by incestuous unions. According to O. A. Bushnell, "in several accounts about Hawaiians, an ali’i who was the issue of an incestuous marriage [ ] was noted for a splendid body and a superior intelligence". Writers have suggested that this preference for brother–sister incest came about as a way to protect the royal bloodline. Notable instances of incestuous relationships among Hawaiian royalty were those between King Kamehameha II and his half sister Kamāmalu, which was a fully fledged marriage, and between Kamehameha III and his full sister Nahienaena. In the latter case, the siblings had hoped to marry but their union was opposed by Christian missionaries.

The Sapa Inca of Peru frequently married their sisters, such between as the children Huayna Capac: Huascar married Chuqui Huipa, Atawallpa married Coya Asarpay, and Manco Inca married Cura Ocllo. During and after the Spanish conquest of the Inca Empire, dynastic marriages began to occur between Inca princesses and Spanish conquistadors. The aforementioned Cura Ocllo married Gonzalo Pizarro following the death of her brother husband, and her sister Quispe Sisa married Francisco Pizarro.