Ulrich III, Duke of Mecklenburg or Ulrich III of Mecklenburg-Güstrow was Duke of Mecklenburg from 1555-56 to 1603. Wikipedia
Born: March 5, 1527, Schwerin, Germany
Died: March 14, 1603 (age 76 years), Güstrow, Germany
Children: Sophie of Mecklenburg-Güstrow
Spouse: Elizabeth of Denmark, Duchess of Mecklenburg (m. 1556–1586)
Grandchildren: Christian IV of Denmark, Anne of Denmark, Elizabeth of Denmark, Duchess of Brunswick-Wolfenbüttel, and more
Great grandchildren: Ulrik of Denmark, Charles I, Elizabeth Stuart, and more