Simplify the following text for a Grade 8 native English-speaking person.
Original: In the Netherlands , he is also known as the Vader des Vaderlands , `` Father of the Fatherland '' , and the Dutch national anthem , Het Wilhelmus , was written in his honor .
Simplified: In the Netherlands , people often call him `` Father of the fatherland '' . The Dutch national anthem , the Wilhelmus , is about William .