TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: MONARCHIES 
Clue: 1 of the 2 largely German-speaking monarchies in the world; they're about 250 miles apart

SOLUTION: liechtenstein & luxembourg

PROBLEM: Category: INVENTORS & INVENTION 
Clue: In April 2008, a man successfully completed a jump using a parachute designed by this man 523 years before

SOLUTION: leonardo da vinci

PROBLEM: Category: ROYALTY 
Clue: The son of an Oscar winner, this prince is also a 5-time Olympian

SOLUTION:
prince albert