The Château du Girsberg is one of three castles (with the Château de Saint-Ulrich and the Haut-Ribeaupierre) which overlook the municipality of Ribeauvillé.
The Lords of Ribeaupierre built the castle, then named Stein (La Roche), in the 13th century. They rebuilt it after a fire caused by lightning in 1288. In 1304, they gave it to their vassals, the knights of Guirsberg, from whom the castle took its name. The Guirsbergs kept it until they died out in the 15th century. It was abandoned in the 17th century.
The remains currently visible contains 13th century pentagonal keep, inner court and corps de logis from the 14th-15th centuries.
References:The Basilica of Santa Maria in Trastevere is one of the oldest churches of Rome. The basic floor plan and wall structure of the church date back to the 340s, and much of the structure to 1140-43. The first sanctuary was built in 221 and 227 by Pope Callixtus I and later completed by Pope Julius I.
The inscription on the episcopal throne states that this is the first church in Rome dedicated to Mary, mother of Jesus, although some claim that privilege belongs to the Basilica di Santa Maria Maggiore. A Christian house-church was founded here about 220 by Pope Saint Callixtus I (217-222) on the site of the Taberna meritoria, a refuge for retired soldiers. The area was made available for Christian use by Emperor Alexander Severus when he settled a dispute between the Christians and tavern-keepers.
The church underwent two restorations in the fifth and eighth centuries and in 1140-43 it was re-erected on its old foundations under Pope Innocent II.