Frederik II van Sierck
Frederick van Sierck was a bishop
A bishop is an ordained or consecrated member of the Christian clergy who is generally entrusted with a position of authority and oversight. Within the Catholic Church, Eastern Orthodox, Oriental Orthodox Churches, in the Assyrian Church of the East, in the Independent Catholic Churches, and in the...

 of Utrecht from 1317 to 1322.

Frederick van Sierck was the protege of William III, Count of Holland, who had managed to get him elected to the bishopric of Utrecht. This way the count was able to increase his influence in the bishopric. This led to friction between the nobility of Utrecht and the provost
Provost (religion)
A provost is a senior official in a number of Christian churches.-Historical Development:The word praepositus was originally applied to any ecclesiastical ruler or dignitary...

 Floris van Jutphaas, who wanted to make an end to Hollandic influence. Floris won a trial over the definition of the jurisdiction between the bishop and the provost.

The construction of the Dom Tower of Utrecht
Dom Tower of Utrecht
The Dom Tower of Utrecht is the tallest church tower in the Netherlands, at 112.5 metres in height, and the Gothic-style tower is the symbol of the city. The tower was part of the Cathedral of Saint Martin, Utrecht, also known as Dom Church, and was built between 1321 and 1382, to a design by...

 began during Frederick's episcopate. The theory that the bishop wanted a strong defendable tower where he would be able to retreat in times of danger, is not universally accepted.

Frederick van Sierck was buried in a chapel named after him in the Dom Church.
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