William I of Holland
Count of Holland and Ostfriesland (1203 - 1222)
He fought with the Imperial army at the battle of Bouvines (1215)
Went on crusade to Damietta (1215 - 1219)
Born (1165) - Died (July 2, 1222)

Father - Floris III of Holland
Mother - Ada of Scotland

William I married firstly (1198) Adelaide of Gueldres
Children :

• Floris IV of Holland
• Otto of Holland (1212 - 1249) Bishop of Utrecht
• William of Holland (c1215 - 1238)
• Richarda of Holland (c1208 - 1262)
• Ada of Holland (c1213 - 1258) nun and Abbess of Rijnsburg

William I married secondly (1220) Marie of Brabant (1191 - 1260)
No children