Gerhard I, Count of Holstein-Itzehoe was the only count of Holstein-Itzehoe. Wikipedia
Born: 1232
Died: December 21, 1290 (age 58 years), Itzehoe, Germany
Grandparents: Adolf III of Holstein and Herman II, Lord of Lippe
Parents: Adolf IV of Holstein and Heilwig of Lippe
Great-grandparents: Adolf II of Holstein and Bernard II, Lord of Lippe
Great grandchildren: Henry II, Count of Holstein-Rendsburg, Valdemar III of Denmark, Helvig of Schleswig, and more