The Friedberg castle was subsequently built to serve as a border security and customs post for the Duchy of Bavaria and Swabia, but put the town in opposition to the free city of Augsburg. It was built between 1257-1264 by Duke Ludwig II.
The castle was the cause of the first burning of Friedberg by Augsburg in 1396. The town was subject to the many frequent wars between Swabia, Bavaria and Augsburg.
A revival in the town's fortunes came when, in 1568, the Duchess Christine chose Friedberg castle as her seat following her husband's death. The town became the centre of Bavarian court life, but was short lived when the town was ravaged by the plague in 1599. More suffering came as the town was sacked twice by the Swedes during the Thirty Years War. After the war only the town hall, castle and city walls were left standing.
The castle is situated on a spur of and has an unusually deep moat. Since the renovation in 1982, Friedberg castle has been a museum.
Narikala is an ancient fortress overlooking Tbilisi, the capital of Georgia, and the Kura River. The fortress consists of two walled sections on a steep hill between the sulphur baths and the botanical gardens of Tbilisi. On the lower court there is the recently restored St Nicholas church. Newly built in 1996–1997, it replaces the original 13th-century church that was destroyed in a fire. The new church is of 'prescribed cross' type, having doors on three sides. The internal part of the church is decorated with the frescos showing scenes both from the Bible and history of Georgia.
The fortress was established in the 4th century and it was a Persian citadel. It was considerably expanded by the Umayyads in the 7th century and later, by king David the Builder (1089–1125). Most of extant fortifications date from the 16th and 17th centuries. In 1827, parts of the fortress were damaged by an earthquake and demolished.