"William II (February 1227 – 28 January 1256) was a Count of Holland and Zeeland from 1234 until his death. He was crowned German anti-king in 1248 and ruled as sole King of the Romans from 1254 onwards." - (en.wikipedia.org 31.01.2020)
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(The left column lists the relations of this actor to objects in the right column. In the middle you find other actors in relation to the same objects.)