Vollenhove was the summer residence of the bishop of Utrecht.

He was consecrated as bishop of Utrecht in July 1150.

Eginhard was a bishop of Utrecht around the year 845.

His book about the bishops of Utrecht, published posthumously, is still seen as a standard work on the subject.

Hartbert was bishop of Utrecht from 1139 to 1150.

Conrad was bishop of Utrecht between 1076 and 1099.

William I was bishop of Utrecht between 1054 and 1076.

From 1046 until 1528, the bishops of Utrecht ruled over Drenthe.

From Hamacarus nothing is known except that he was a bishop of Utrecht.

As a result, he came into conflict with the bishop of Utrecht, other bishops and monasteries in the surrounding area.