King Ferdinand II died on June 23, 1516 in Madrigalejo, Spain for an unspecified reason.
King Ferdinand VII of Spain died on September 29, 1833 at the age of 48.
he died in 1874
King Ferdinand VI of Spain died on August 10, 1759 at the age of 45.
King Ferdinand I of Romania died on July 20, 1927 at the age of 61.