Bischofszell Castle

Castle, Bischofszell
The castle served as the episcopal administration center and after the conquest of Thurgau by the Confederates in 1460 as a bailiwick seat. Today, the municipal technical services are housed in the castle.
Text / Source: City of Bischofszell
bischofszell.ch/Seeing/9946#:~:text=The%20castle%20served%20as%20bisch%C3%civil,castle%20housed%20the%20technical%20community%20.

Castle, Bischofszell
The former bishop's castle of the diocese of Constance is located within the city walls in the south-west corner of the city of Bischofszell. It is protected by steep slopes to the south and west. Old views still show the tower, which was demolished in 1843 and according to legend, built under Bishop Solomon III. was built by Constance to protect against the Hungarians. The shape of the ground floor of the castle points to the 13th or the beginning of the 14th century as the construction period; the upper floor probably originates from a new building undertaken around 1500. The castle served as the residence of the Bishop of Constance's Obervogt; he was patron of the secular choir monastery of St. Pelagius in Bischofszell, presided over the town council and maleficent court and exercised the episcopal judicial authority over the Schönenberger office. After the abolition of episcopal rule in 1798, the castle passed into private ownership.[1] A tapestry from 1500 in the Basel Historical Museum shows what is probably the oldest view of the castle.
Text/Source: Wikipedia
de.wikipedia.org/wiki/Schloss_Bischofszell

Bischofszell Castle was originally the bishop's castle. The lower part of the residential building dates back to the 13th century, while the upper part was built after the town fire of 1419. The eastern extension dates from 1813.