Le Château des Ducs in Alençon represents the remains of a powerful 12th-century fortress and symbol of Normandy's medieval heritage. Originally built as a key defensive stronghold, the castle features a Romanesque keep erected by Henry I Beauclerc in 1113, with impressive remaining elements including the entrance pavilion, two high crenellated towers, and a crowned tower. The site exemplifies medieval military architecture and played a significant role in Norman history. Today, the partially preserved château stands within Alençon, an exceptionally preserved medieval city designated as a Remarkable Heritage Site, where visitors can explore vestiges of this historic fortress amid the charming Saint-Léonard quarter and architectural landmarks like the Basilica Notre-Dame.