Ludwig II, Landgrave of Thuringia, nicknamed Louis the Iron. Wikipedia
Born: 1128
Died: October 14, 1172 (age 44 years), Schloss Neuenburg, Freyburg, Germany
Great-grandparents: Louis the Bearded, Cecily of Sangerhausen, Mathilde of Montbéliard, and more
Parents: Louis I, Landgrave of Thuringia and Hedwig of Gudensberg
Grandparents: Louis the Springer and Giso IV, Count of Gudensberg
Great grandchildren: Henry III, Margrave of Meissen, Hermann II, Landgrave of Thuringia, Sophie of Thuringia, Duchess of Brabant, and more