Heads had rolled as his father King Henry VIII did everything he could to produce a male heir, but Edward died at 15 years old after a 6-year reign — Born in 1537, the son of King Henry VIII and Jane Seymour, Edward was only nine years old when his father died in 1547. Effective power was exercised firstly by Edward’s maternal uncle Edward Seymour, Earl of Somerset, and then by John Dudley, Duke of Northumberland.