In a meeting of the episcopate in 1936, it was made clear that this diocese, which encompasses about a third of Norway's population, could not be managed by a single bishop.

Historically Tønsberg had been an important ecclesiastical center in Norway; in the Middle Ages, there were as many as seven churches and three monasteries in this small urban community.

[2] King Haakon VII was present at the episcopal consecration in Tønsberg Cathedral on June 20, 1948.

A fresco painted directly on the wall above the south door, depicts Jesus as the Good Shepherd.

[6] The Diocese of Tønsberg is divided into nine deaneries (Norwegian: prosti) spread out over Buskerud and Vestfold counties.