How many league titles has the Norwegian professional football club for which Jan Christiansen played in Trondheim won?
Jan Christiansen:  He played for Rosenborg BK in Trondheim from 1966 to 1975, earning three league titles and one cup championship. Rosenborg BK: The club have won a record 24 league titles, eleven Norwegian Football Cup titles and have played more UEFA matches than any other Norwegian team.
24