- Born on June 24, 1254 in Leiden
- Assassinated on June 27, 1296 in Muiden, at Muiderberg, at the age of 42 years
Parents
- Willem II van Holland (1227 - 1256), graaf van Holland
- Elisabeth von Braunschweig-Lüneburg ( - 1266)
Family
- Married with Béatrice de Dampierre, issuing
- Jan (1284 - 1299)
- Relationship with Aleid van Heusden