In 955 Emperor Otto I granted his estates in Zizers to the Bishop of Chur. Friedau Castle may have been built on the site of one of the buildings from this 10th century grant. Construction on the castle begun under Bishop Volkart von Neuenburg (1237-1251) but was completed under Heinrich IV von Montfort (1251-1272). Once it was completed it became the administrative center of the Herrschaft and the home of the bishop's landvogt.
Because the bishop often needed loans and donations, he used the castle as collateral for loans or as a reward for donations. In 1358 it was given as collateral to Beringers von Landenberg and four years later, in 1362, Bishop Peter Gelyto gave it to Kunigunde von Toggenburg. The Toggenburgs held the castle until the death of Frederick VII in 1436 and the extinction of the Toggenburg family. It appears that the castle had already fallen into ruin by 1387 and the bishop was just granting the rights to the lands and taxes associated with the castle. With those rights, the bishop included a clause that if the castle was rebuilt, the lands would return to him.
The castle must have been rebuilt sometime after the extinction of the Toggenburgs, because in 1503 there was once again a vogt at Friedau. In 1550 the chronicler Ulrich Campell recorded that the castle was a tower surrounded by a wall and moat. In 1649 the bishop sold the castle to the Vier Dörfer. From then on the castle was used as a prison and gradually became known as the Schelmenturm. In 1880 the tower was heavily damaged in a fire which destroyed much of Zizers. The heat was so intense that the stones in the wall cracked and two large rents opened up in the tower.
During an archeological excavation of the tower in 2016 several finger and foot bones as well as a leg bone were discovered. Initial speculation was that the bones came from tortured prisoners. However, Carbon-14 dating found that the bones dated from before the tower was built in the 13th century.
The castle is located in the center of Zizers. It is a square tower about 11.5 by 11.5 meters and has walls that are up to 2.3 m thick. It was originally four stories tall with a high entrance on the second story east side. Following the 1880 fire two large cracks have opened up in the walls.References:
Stavanger Cathedral is Norway's oldest cathedral. Bishop Reinald, who may have come from Winchester, is said to have started construction of the Cathedral around 1100. It was finished around 1150, and the city of Stavanger counts 1125 as its year of foundation. The Cathedral was consecrated to Swithin as its patron saint. Saint Swithun was an early Bishop of Winchester and subsequently patron saint of Winchester Cathedral. Stavanger was ravaged by fire in 1272, and the Cathedral suffered heavy damage. It was rebuilt under bishop Arne, and the Romanesque Cathedral was enlarged in the Gothic style.
In 1682, king Christian V decided to move Stavanger's episcopal seat to Kristiansand. However, on Stavanger's 800th anniversary in 1925, king Haakon VII instated Jacob Christian Petersen as Stavanger's first bishop in nearly 250 years.During a renovation in the 1860s, the Cathedral's exterior and interior was considerably altered. The stone walls were plastered, and the Cathedral lost much of its medieval looks. A major restoration led by Gerhard Fischer in 1939-1964 partly reversed those changes. The latest major restoration of the Cathedral was conducted in 1999. Andrew Lawrenceson Smith is famous for his works here.