Father: Count Gotthard II of Kettler Born: 1480 Married: Unknown Died: February 9, 1556
Mother: Princess Sybilla of Nesselrode Born: 1490 Died: 1571
Children: 1. Bishop Wilhelm of Munster (b.1511) 2. Count Johann of Kettler (b.1512) 3. Count Wirich of Kettler (b.1515) 4. Duke Godhard of Kurland (b.1517)