Task: Question Generation
Input (English): Context : Gotthard von Kettler (also Ketteler, German: Gotthard Kettler, Herzog von Kurland; 2 February 1517 -- 17 May 1587) was the last Master of the Livonian Order and the first Duke of Courland and Semigallia. 
Answer : 17 May 1587
Output (English): What was the death date of Gotthard Kettler?