Alter do Chão
A castle rebuilt by King Pedro I and the world’s oldest stud farm, breeding the grey Alter Real horses since 1748.

Alter do Chão is a town with two famous names to its credit: a medieval castle rebuilt by King Pedro I, and the oldest stud farm in the world still working from its original site, where the grey Alter Real horses — the pride of Portuguese equestrian art — have been bred since the 18th century.
A castle and the horses of kings
The castle’s square keep rises some 44 metres over the little town, its Gothic portal and marble inscription marking the rebuilding ordered by Pedro I in 1357; the fortress later passed to the Constable Nuno Álvares Pereira and, by inheritance, to the House of Braganza. Four kilometres away, behind the walls of the Tapada do Arneiro estate, lies the Coudelaria de Alter — founded in 1748 in the spirit of the royal stud farms of João V, it is the oldest Portuguese stud farm and the only one in the world running without interruption on its founding site. Visits take in the courtyards, the chapel and the stables, with falconry displays on some days. The region is castle country: pair the visit with Marvão y Castelo de Vide, both a short drive north.
What to see
- The castle keep and its vaulted hall
- The Coudelaria de Alter and its Alter Real horses
- The old town, pillory and parish church
- The Tapada do Arneiro estate landscape
- The nearby castles of Alter Pedroso and Marvão
Practical information
Alter do Chão lies in the Alto Alentejo, about half an hour from Portalegre and two hours from Lisbon. Stud-farm visits are guided and run Tuesday to Sunday, generally at 10.30 and 15.00; booking ahead is recommended. Castle visits are free.
Image credit: Castelo de Alter do Chão by FenandoLBMaria — CC BY-SA 4.0, via Wikimedia Commons.
Para visitar
More to explore
Zambujeira do Mar
The fishing village on the tall Alentejo cliffs, with stairs to the beach, the Fishermen’s Trail and storks nesting over…
Anta Grande do Zambujeiro
The largest dolmen in Iberia: seven six-metre pillars, a menhir with cup marks and five millennia of silence near Évora.
Castelo de Noudar
A castle with no town, founded in 1308 on the Spanish border — now a nature park among olive groves…
Experiencias





