Көне Үндістанның Косала патшалығы

One of the Mahajanapadas

Kosala, sometimes referred to as Uttara Kosala was one of the Mahajanapadas of ancient India. and became (along with Magadha) one of the earliest states to transition from a lineage based society to a monarchy. By the 6th century BCE, it had consolidated into one of the four great powers of ancient northern India, along with Magadha, Vatsa, and Avanti. Kosala belonged to the Northern Black Polished Ware culture (c. 700–300 BCE) and was culturally distinct from the Painted Grey Ware culture of the neighboring Kuru Panchala region, following independent development toward urbanisation and the use of iron. The presence of the lineage of Ikshavaku—described as a raja in the Ṛgveda and an ancient hero in the Atharvaveda—to which Rama, Mahavira, and the Buddha are all thought to have belonged—characterized the Kosalan realm. One of India's two great epics, Ramayana is set in the "Kosala Videha" realm in which the Kosalan prince Rama marries the Videhan princess Sita. After a series of wars with neighbouring kingdoms, it was finally defeated and absorbed into the Magadha kingdom in the 5th century BCE. After the collapse of the Maurya Empire and before the expansion of the Kushan Empire, Kosala was ruled by the Deva dynasty, the Datta dynasty, and the Mitra dynasty.

Kosala was bounded by the Gomti River in the west, Sarpika River in the south, Sadanira in the east which separated it from Videha, and the Nepal Hills in the north. It encompassed the territories of the Shakyans, Mallakas, Koliyas, Kālāmas and Moriyas at its peak. It roughly corresponds to modern day Awadh region in India.

The Kosala region had three major cities, Ayodhya, Saketa and Shravasti, and a number of minor towns as Setavya, Ukattha, Dandakappa, Nalakapana and Pankadha. According to the Puranas and the Ramayana epic, Ayodhya was the capital of Kosala during the reign of Ikshvaku and his descendants. Shravasti is recorded as the capital of Kosala during the Mahajanapada period (6th–5th centuries BCE), but post Maurya (2nd–1st centuries BCE) kings issued their coins from Ayodhya.

Kosala belonged to the Northern Black Polished Ware culture (c. 700–300 BCE), which was preceded by the Black and red ware culture (c. 1450–1200 BCE until c. 700–500 BCE). The Central Gangetic Plain was the earliest area for rice cultivation in South Asia, and entered the Iron Age around 700 BCE. According to Geoffrey Samuel, following Tim Hopkins, the Central Gangetic Plain was culturally distinct from the Painted Grey Ware culture of the Vedic Aryans of Kuru Pancala west of it, and saw an independent development toward urbanisation and the use of iron.

Kosala was situated at the crossroads of Vedic heartland of Kuru Panchala and Greater Magadhan culture. According to Alexander Wynne, Kosala Videha culture was at the center of unorthodox Vedic traditions, ascetic and speculative traditions, possibly reaching back to the late Ṛgveda. Kosala Videha culture is thought to be the home of the Śukla school of the Yajurveda. According to Michael Witzel and Joel Brenton, the Kāṇva school of Vedic traditions (and in turn the first Upanishad i. e, Bṛhadāraṇyaka Upaniṣad) was based in Kosala during the middle and late Vedic periods. Kosala had a significant presence of the muni tradition, which included Buddhists, Jains, Ajivikas, Naga, Yakṣa, and tree worshipers as well as Vedic munis. The muni tradition emphasized on "practicing yoga, meditation, renunciation and wandering mendicancy" as contrasted to the ṛṣis who "recited prayers, conducted homa, and led a householder lifestyle". In the Majjhima Nikāya too, king Prasenajit refers to Buddha as a Kosalan. He spent much of his time teaching in Śrāvastī, especially in the Jetavana monastery. According to Samuels, early Buddhism was not a protest against an already established Vedic Brahmanical system, which developed in Kuru Pancala realm, but an opposition against the growing influence of this Vedic Brahmanical system, and the superior position granted to Brahmins in it.

Mahavira, the 24th Tirthankara of Jainism taught in Kosala. A Buddhist text, the Majjhima Nikaya mentions Buddha as a Kosalan, which indicates that Kosala may have subjugated the Shakya clan, which the Buddha is traditionally believed to have belonged to.

Kosala is not mentioned in the early Vedic literature, but appears as a region in the later Vedic texts of the Shatapatha Brahmana (7th 6th centuries BCE, final version 300 BCE) and the Kalpasutras (6th century BCE).

In the Ramayana, Mahabharata and the Puranas the ruling family of the Kosala kingdom was the Ikshvaku dynasty, which was descended from king Ikshvaku. The Puranas give lists of kings of the Ikshvaku dynasty from Ikshvaku to Prasenajit (Pali: Pasenadi). According to the Ramayana, Rama ruled the Kosala kingdom from his capital, Ayodhya.

Koshala's first capital of Shravasti was barely settled by the 6th century BCE, but there is the beginnings of a mud fort. By 500 BCE, Vedic people had spread to Koshala. By the 5th century BCE under the reign of King Mahakosala, the neighboring Kingdom of Kashi had been conquered. Mahakosala's daughter was the first wife of King Bimbisara of Magadha. As a dowry, Bimbisara received a Kashi village that had a revenue of 100,000. This marriage temporarily eased tensions between Koshala and Magadha. The Sohgaura copper plate inscription, probably issued during the reign of Chandragupta Maurya deals with a famine in Shravasti and the relief measures to be adopted by the officials. The Yuga Purana section of the Garga Samhita mentions about the Yavana (Indo Greek) invasion and subsequent occupation of Saket during the reign of the last Maurya ruler Brihadratha or Pushyamitra Shunga.

The names of a number of rulers of Kosala of the post Maurya period are known from the square copper coins issued by them, mostly found at Ayodhya. The rulers, forming the Deva dynasty, are: Muladeva, Vayudeva, Vishakhadeva, Dhanadeva, Naradatta, Jyesthadatta and Shivadatta. There is no way to know whether king Muladeva of the coins is identifiable with Muladeva, murderer of the Shunga ruler Vasumitra or not (though a historian, Jagannath has tried to do so). King Dhanadeva of the coins is identified with king Dhanadeva (1st century BCE) of Ayodhya inscription. In this Sanskrit inscription, King Kaushikiputra Dhanadeva mentions about setting a ketana (flag staff) in memory of his father, Phalgudeva. In this inscription he claimed himself as the sixth in descent from Pushyamitra Shunga. Dhanadeva issued both cast and die struck coins and both the types have a bull on obverse. Other local rulers whose coins were found in Kosala include: a group of rulers whose name ends in " mitra" is also known from their coins: Satyamitra, Aryamitra, Vijayamitra and Devamitra, sometimes called the "Late Mitra dynasty of Kosala". Other rulers known from their coins are: Kumudasena, Ajavarman and Sanghamitra.