Roggeborgen, Medieval bishop residence in Strängnäs, Sweden.

Roggeborgen is a stone mansion near Strängnäs Cathedral that once served as the bishop's home. The building was later renovated and gained a stone exterior with two bay windows that are still visible today.

The building was constructed in the late 1400s by Bishop Kort Rogge, after whom it is named. It became historically important when Gustav Vasa was elected King of Sweden here in 1523.

Since 1968 the building has housed the Rogge Library, transferred here by the Royal Library: some 70,000 printed volumes plus several manuscripts. It is not the same as Strängnäs Cathedral Library, founded in the 14th century. The former assembly hall served the grammar school as an auditorium and examination room into the 1960s.

The building is located in Strängnäs town center and can only be visited through organized tours that run throughout the year. It is helpful to check ahead for tour times to plan your visit.

A covered passageway once connected the building directly to the cathedral next door. This allowed the bishop to reach the church without stepping outside, even in bad weather.