Château d'Amblève, Medieval castle ruins in Aywaille, Belgium

Château d'Amblève is a ruined medieval fortress on a granite crag above the Amblève, the highest point of the valley. Only a short, broken wall of rough grey stone remains at the crest, partly screened by bushes, with no roof, windows or inscription. Dense trees grow along the top and down the slope.

A fortified house called Tour de Sprimont, given to Stavelot Abbey in 855, preceded the castle, which was built in the 13th century and defended Sprimont until its demolition in 1578. From the early 15th to the late 16th century it belonged to the La Marck-Arenberg branch, a Walloon noble family holding the duchy of Bouillon and the county of Arenberg. A 741 mention of Griffon, son of Charles Martel, being held here is uncertain, as Chèvremont is also cited.

The castle functioned as a judicial center for the surrounding lands and served as home to powerful local families who shaped the region's medieval society.

The ruins belong to the private domain of the Château d'Emblève below and are not open to visitors. The steep path and the risk of collapse or falling stones make access dangerous. The municipal boundary of Aywaille, which now contains the site, passes a few dozen metres from the structure.

The name Château des quatre Fils Aymon links the ruin to the medieval epic of the four sons of Aymon, and the site has also been estimated as a 10th-century construction. The sources place its demolition in 1578, after which it served as the seat of justice of Sprimont and residence of its lords.