The Imperial Palace in Ingelheim was erected in the second half of the 8th century. Charlemagne chose Ingelheim in 787 as the location for his winter quarters, arriving there before Christmas and remaining there without interruption until the middle of 788. However the palace was not completed before completed before 814. It served Emperors and Kings as a residence and place for governance until the 11th century. From the buildings of the Imperial Palace impressive relics above ground are preserved today. The greater part of the complex remains as foundation under ground level and allows it to be the basis for archaeological excavations to reconstruct the entire system of buildings.
References:The Château de Foix dominates the town of Foix. An important tourist site, it is known as a centre of the Cathars. Built on an older 7th-century fortification, the castle is known from 987. In 1002, it was mentioned in the will of Roger I, Count of Carcassonne, who bequeathed the fortress to his youngest child, Bernard. In effect, the family ruling over the region were installed here which allowed them to control access to the upper Ariège valley and to keep surveillance from this strategic point over the lower land, protected behind impregnable walls.
In 1034, the castle became capital of the County of Foix and played a decisive role in medieval military history. During the two following centuries, the castle was home to Counts with shining personalities who became the soul of the Occitan resistance during the crusade against the Albigensians.