Castle of Amieira do Tejo
| Castle of Amieira (Castelo de Amieira) | |
| Castle of Amieira do Tejo | |
| castle (Castelo) | |
 Tower of the Amieira do Tejo, part of the medieval castle complex
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| Official name: Castelo de Amieira do Tejo | |
| Country |  Portugal |
|---|---|
| Region | Alentejo |
| Subregion | Alto Alentejo |
| District | Portalegre |
| Municipality | Nisa |
| Location | Amieira do Tejo |
| - elevation | 214 m (702 ft) |
| - coordinates | 39°30′28.90″N 7°48′58.41″W / 39.5080278°N 7.8162250°WCoordinates: 39°30′28.90″N 7°48′58.41″W / 39.5080278°N 7.8162250°W |
| Length | 60.09 m (197 ft), Northwest-Southwest |
| Width | 59.04 m (194 ft), Southwest-Northeast |
| Architects | unknown |
| Styles | Medieval, Gothic architecture |
| Materials | Granite, Calcium Oxide, Sand, Wood, Tile |
| Origin | c. 1256 |
| - Initiated | 14th century |
| - Completion | fl. 1358 |
| Owner | Portuguese Republic |
| For public | Public |
| Visitation | Closed (1 January, Easter Sunday, 1 May and 25 December) |
| Easiest access | Praça de Nun'Alvares |
| Management | Instituto Gestão do Patrimonio Arquitectónico e Arqueológico |
| Weekly | 9:00 a.m.-12:30 p.m., 2:00 p.m.-5:00 p.m. |
| Status |
National Monument Monumento Nacional |
| Listing | Decree No.8/447, DG 233, 10 November 1922 |
The Amieira do Tejo Castle is a Portuguese castle in the civil parish of Amieira do Tejo, municipality of Nisa, in the antique district of Portalegre, approximately 200 kilometres from the city of Lisbon
In 1232, owing to a regal charter issued by King Sancho II, the dominion of the Knights Hospitaler expanded their influence into the south; the religious order expanded into the villas of Amieira, Gavião and Crato. In Crato, they carried out construction projects, to establish their institutional seat, just after the donation.
The construction of the castle in Amieira only developed a century after the Hospitalers had taken possession of the territory. Its construction was the responsibility of Álvaro Gonçalves Pereira, son of the Archbishop of Braga Gonçalo Pereira, prior of the Order of the Hospital and father of the future-constable of the kingdom, Nuno Álvares Pereira. It was Gonçalo Pereira who had originally been responsible for transferring the Order from Leça do Bailio to Crato e Mártires (in 1356). The castle of Amieira was constructed as part of the settlement's place in the new function of the Order: to assist the travelling pilgrims. Three years following this change in roles, King Peter I visited the fortress, whose construction was already quite advanced. But, by 1362, the project had not been concluded: Álvaro Gonçalves Pereira had taken a lot of pacience in the construction and evolution of the castle, until his death in 1375.
The fortress suffered various modifications over the centuries. During the reigns of King John II and King Manuel, there were remodelling to adapt the structure to the new military requirements. Simultaneously, it served as a prison, due to its excellent construction. Losing its military function, due to the change in the lines of defence over time, the castle fell in importance. In the 18th century, a great part of the historical structure was abandoned, and part of the fortress was adapted for civil residences. By this time, the prison tower was partially recuperated, but its military functionally was completed abandoned.
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