The building of Lescar Cathedral was begun in 1120 by Bishop Guy de Lons, and was sacked by the Protestants during the reign of Jeanne III of Navarre. It was restored in the 17th and 18th centuries. The apse, housing a pavement mosaic from the 12th century with hunting scenes, is in Romanesque style. In the interior, columns have capitals depicting histories of the life of Daniel, of the birth of Christ and the Sacrifice of Isaac.
From the end of the 15th century the cathedral was used as the burial place of the royal family of Navarre. Francis Phoebus was buried here in 1483, followed by Catherine of Navarre, her consort Jean d'Albret and several of their children, among them Henry II of Navarreand his wife Marguerite of Angoulême, grandparents of King Henry IV of France.
Of the funerary monuments ordered by Henry II, subjected to iconoclastic damage by Protestants and to the collapse of the sanctuary vault in 1599, nothing remains. Archaeological excavations in 1928-1929 were successful however in rediscovering the royal crypt and the remains of its occupants.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.