Father: Prince Johann I of Mecklenburg-Gustrow Born: 1217 Married: Unknown Died: 1264
Mother: Princess Liutgard of Henneberg Born: 1219 Died: June 14, 1267
Children: 1. Princess Elisabeth of Mecklenburg (b.1236) 2. Prince Heinrich I of Mecklenburg (b.1240) 3. Duke Albrecht I of Mecklenburg (b.1242) 4. Duke Nikolaus III of Mecklenburg (b.1245) 5. Duke Johann II of Mecklenburg (b.1247) 6. Duke Poppo of Mecklenburg (b.1248) 7. Duke Hermann of Mecklenburg (b.1249)