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Chaves (ˈʃavɨʃ) is a city and a municipality in the north of Portugal. It is 10 km south of the Spanish border and 22 km south of Verín (Spain). The population of the entire municipality in 2011 was 41,243, in an area of 591.23 km2. The municipality is the second most populous of the district of Vila Real (the district capital, Vila Real, is 60 km south on the A24 motorway). With origins in the Roman civitas Aquæ Flaviæ, Chaves has developed into a regional center. The urban area or city proper has 17,535 residents (2001).

Artefacts discovered in the region of Chaves identify the earliest settlement of humans dating back to the Paleolithic. Remnants discovered in Mairos, Pastoria and São Lourenço, those associated with transient proto historic settlements and castros, show a human presence in the Alto Tâmega dating to the Chalcolithic. promoted the baths (with its warm medicinal waters); exploited local mines and alluvial deposits and other natural resources. Its importance led to the urban nucleus being elevated to the status of municipality in 79 AD, during the reign of the first Flavian Caesar, Titus Flavius Caesar Vespasianus Augustus. Rome's hegemony lasted until the 3rd century, when, successively, the proto Germanic tribes of the Suebi and Visigoths as well as the Alani colonized the imperial settlements of Chaves. Barbarian dominion lasted until the Moors invaded from North Africa, defeating the Visigoth King Roderic at the beginning of the 8th century. The area around Chaves surrendered to invading Islamic forces at around 714 716, forcing many resisting Christians to escape from Chaves into the mountains in the northwest. The city was conquered by Alfonso I of Asturias in 773, alongside Braga, Porto and Lamego, and repopulated in 868 by Alfonso III of Asturias. Battles between the Christians and Muslim forces then continued until the 11th century, when Alfonso V of León permanently reconquered Coimbra, establishing a firm buffer zone to the south. The Leonese fought battles in Barcelos, Braga and Guimarães, where they defeated Portuguese forces, before retiring to Galicia with their spoils. This was likely a self serving decision on Fernando's part, as he was fearful that Leonese barons would support Sancho against him. Alfonso IX continued to occupy Chaves as a method of ensuring his wife, Teresa, would be able to enjoy her properties in Portugal. Yet, many nobles refused to break their oaths of fealty to Beatrice (including in Chaves), necessitating John's travel to Porto in force and scaring the nobles of Chaves and Bragança into capitulating. French forces invaded and attacked in 1807, during the Siege of Chaves, part of the Peninsular Wars. On 7 March 1808, Soult's forces invaded northern Portugal to remove British forces from Iberia. Brigadier Francisco Silveira was charged with the defense of Chaves, but his 6000 men were unable to support its defense, and quickly abandoned the castle. An attempt to defend Chaves by Francisco Pizarro was futile, and the city surrendered to French forces shortly after the engagement. With too many troops to imprison Soult released many under oath, in order to continue the attack on the main forces who had retreated to the south. On 12 March 1929, the town of Chaves was elevated to the category of city. Mixed with the schistose complex, there are bands of graphitic slates, mainly in the southern part of the urbanized area of Chaves and south east of Faiões. The Chaves graben was formed by the relative motion of the block with different types of sediments being settled. The most recent formations are a sedimentary series (lacustrine, alluvial, colluvial, detritic, etc.) with variable thickness that had their origin during the Miocene. Two main faults cross and influence the tectonic activities: the north northeast by south southeast Chaves Verin Fault and a fault system crossing near Faiões and Santo Estêvão. Intense neotectonic activity reactivated these old fractures, originating in a complex pattern of faults in the sedimentary basin.

In the past 127 years, the municipality has seen a 29% increase in local population (from 31815 in 1864 to 40940 in 1991). This was not a gradual nor homogeneous increase, since there were periods of extreme growth or rapid decline. During the 20th century, growth after 1920 is notably influenced by the restriction of trans Atlantic emigration, just like after 1991, the population decreases were associated with liberal emigration policies as a result of the Maastricht Treaty. The parish populations have seen fluctuations, although the most recent census show that 31 of these agglomerations had population levels in 1991 much lower than their first tabulation. Further, analysis of the data identifies that the municipal increase (29%) was primarily from the more urbanized parishes, while peripheral rural/mountainous parishes show net decreases. Many of the local people have emigrated to settlements in northern Europe in addition to France, but commonly return or visit their villages for weddings or village festivals. Many residents of Chaves have also immigrated to Connecticut and New Jersey in the United States. Chaves has been isolated from the coastal urban centers and has suffered from a lack of convenient road communications. Recently, a new four lane highway (A24) was opened to traffic. It links Chaves to Vila Real, and to the border with Spain. In Vila Pouca de Aguiar the highway also connects with the A7 that leads to Porto.

The population of the city encompasses 17,535 residents in the parishes of Santa Cruz Trinidade, Madalena, and Santa Maria Maior: these parishes form the urbanized population of the city of Chaves. Although many of the older buildings outside the historical walls were demolished to make way for apartment blocks, the medieval quarter with its Rua Direita and Rua de Santo António have been declared historic zones. In these areas there are narrow multi story dwellings, whose origin has been limited by the walled city. Historically, the old quarter was the city, and few buildings were located outside its walls, since its frontier location and the imminent risk of invasion impeded the construction of homes outside the barriers. Consequently, space was limited and land primarily used for multi purpose dwellings, resulting in very narrow streets and multi story structures (with balconies that extend over the streets and protected the citizenry). Many of the lower floors were occupied by shops or small businesses, while the residents lived in the upper stories. Remnants of these verandas are still visible in the medieval quarter. The walled city was at the forefront of the political turmoils during the Reconquista, transited by armies and sacked by enemies. Chaves was built, destroyed, and rebuilt several times by either faction (Christian and Muslim), when they occupied the castle (it is likely that for some periods the town was completely abandoned). In 1253, Afonso III supported the reconstruction of the castle. By 1258, Chaves was granted the status of a vila (or town). While the walls were eventually rebuilt, the advent of artillery would make the castle's fortifications obsolete, and its importance waned, while the historical battlements fell into ruins. On 15 November 2009 an extensive green space on the east side of the Tâmega River, between the Engenheiro Carmona Bridge and the Public Gardens, was opened to the public. It is an area with playgrounds, pedestrian and cycling paths, a beach football pitch, and a large grassy area. A modern pedestrian bridge was constructed to link the park and recreational area with the hot springs on the west bank of the river. At the same time cycling and walking paths were built on both banks of the river extending north for several kilometers. The pedestrian bridge, which is approximately 90 ft, is Chave's tallest and most expensive bridge.

Agriculture and services are still the main sources of income. The traditional prosperity of Chaves comes, mainly, from a highly fertile plain, nine kilometres long and three to five wide, referred to as the"veiga". Since the land can be irrigated with canals there is intensive farming of potatoes, corn, rye, hay, while plots of vegetables are also commonplace in the local market. The main canal begins near Vila Verde da Raia and crosses the valley on the right bank of the Tâmega as far as Nantes. On the whole, the land is made up of small plots that are rarely economically viable. There is some dairy farming, and a milk production unit on the south side of town, but few cows can be seen in the valley. In general most of the farmers are of retirement age and farming is often pursued more as a hobby than as a profession. In addition to agriculture there are some small industries producing glass, tiles, and food products. Like Vila Pouca de Aguiar, located thirty kilometres south, this is a land of granite; there are several granite extraction and finishing industries located in Chaves, in addition to three brickworks, located on the south side of the city. Further, two mineral water plants, located in Vidago, belong to the municipality.

It is serviced by A24 motorway, which links Chaves with the south, to Viseu, Coimbra and Figueira da Foz, connecting to Vila Pouca de Aguiar by the A7 (which acts as the gateway to the southern Trás os Montes), and the N103 from Bragança to Braga. Chaves is located 415 kilometres from Lisbon, 105 kilometres from Porto and just 55 kilometres from the district capital, Vila Real. Between 1921 and 1990 Chaves was the northern terminus station of the Corgo line, a narrow gauge railway line which linked Chaves with Vila Real and Regua (the junction station for main line trains to Porto). The section between Chaves and Vila Real closed in 1990 and the remainder of the line closed in 2009. Chaves Airport, a small, single runway airport for light aircraft, also serves the town.

The town of Chaves is built upon a long military history, that includes many fortifications or vestiges of battlements. Apart from the medieval castle and 17th century forts (Forte de São Francisco andForte de São Neutel), two medieval fortifications still exist: Santo Estêvão Tower (in the village of the same name north of Chaves) and Monforte Castle (in the hills east of the town).