The Governor-General of the United Provinces during the Seige of Sluis died during which time frame?
Siege of Sluis (1587):  On 12 June 1587, Don Alexander Farnese, Duke of Parma "(Spanish: Alejandro Farnesio)", Governor-General of the Spanish Netherlands, and commander-in-chief of the Army of Flanders, laid siege to the strategic deep-water port of Sluis, defended by English and Dutch troops under Sir Robert Dudley, Earl of Leicester, Governor-General of the United Provinces, and Sir Roger Williams. Robert Dudley, 1st Earl of Leicester: Robert Dudley, 1st Earl of Leicester (24 June 1532 or 1533 – 4 September 1588) was an English nobleman and the favourite and close friend of Elizabeth I's, from her first year on the throne until his death.
24 June 1532 or 1533 – 4 September 1588