The Catholic Encyclopedia, Volume 16 [Supplement]

The diocese included the provinces (amter) of Aarhus and
Randers, the islands of Samso and Tuno, and, after 1396, part of
the province of Viborg. Frode, King of Jutland, built the church
of the Holy Trinity at Aarhus about 900. In 948 Archbishop
Adaldag of Hamburg consecrated Reginbrand as missionary Bishop
of Aarhus. After the latter's death in 988 all Jutland was
united in one diocese, with Ribe or Viborg as its centre. It was
redivided in 1060, and one Christian was ordained Bishop of
Aarhus by Adalbert I, Archbishop of Hamburg. Another bishop,
Ulfketil (1102-34) planned the town of Aarhus. The warlike Svend
Udsson (1166-91) founded the Cistercian abbey at Om.