The Castle of Alter do Chão, in Alentejo, is located in the parish of Alter do Chão, in the village and municipality of the same name, district of Portalegre, in Portugal.
In the historic center of the village, this castle is representative of medieval architecture from the 17th century, when it cooperated with the neighboring Castle of Alter Pedroso in the defense of this region.
The castle's current configuration dates back to the reign of Pedro I (r. 1357–1367), which determined its reconstruction on September 22, 1357, according to the marble epigraphic plaque on the main gate. The sovereign reformed the Foral da vila in 1359. Fernando I (r. 1367–1383) donated the domains of the village to Nuno Álvares Pereira, who in turn donated them to Gonçalo Eanes de Abreu.
In the historic center of the village, this castle is representative of medieval architecture from the 17th century, when it cooperated with the neighboring Castle of Alter Pedroso in the defense of this region.
The castle's current configuration dates back to the reign of Pedro I (r. 1357–1367), which determined its reconstruction on September 22, 1357, according to the marble epigraphic plaque on the main gate. The sovereign reformed the Foral da vila in 1359. Fernando I (r. 1367–1383) donated the domains of the village to Nuno Álvares Pereira, who in turn donated them to Gonçalo Eanes de Abreu.
