Father: Count Dietrich III of Westfriesland Born: 993 Married: Unknown Died: May 27, 1039
Mother: Princess Otehildis of Nordmark Born: 999 Died: March 9, 1044
Children: 1. Count Dietrich IV of Westfriesland (b.1019) 2. Count Florenz I of Westfriesland (b.1021) 3. Princess Bertrada of Westfriesland (b.1023)