John, Prince of Schleswig-Holstein
Member of the House of Oldenburg ‧ Frederick II of Denmark's son
Johan of Schleswig-Holstein was the youngest son of Frederick II of Denmark and Norway and Sophia of Mecklenburg-Schwerin. He went to Russia in 1602 as the bridegroom of Boris Godunov's daughter Ksenia, but fell ill and died before the marriage... Wikipedia
Born: July 9, 1583
Died: October 28, 1602 (age 19 years), Moscow, Russia
Parents: Frederick II of Denmark and Sophie of Mecklenburg-Güstrow
Siblings: Anne of Denmark and Christian IV of Denmark