Tugthus og Akershus Fæstnings Slaveri, Oslo, Norway Genealogy
Microfilm at the Family History Library contain parish registers from Oslo prison and Akershus fortress penitentiary. Were separated from Garnison parish in 1838. Records are for 1839-1912. Akershus Festning Slaveri has its own parson from February 8, 1854.
Images of the church books are online at Digitalarkivet.