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: OLD HISTORY 
Clue: In this work Virgil wrote that "a woman is always a fickle, unstable thing"

SOLUTION: the aeneid

PROBLEM: Category: SIBLING REVELRY 
Clue: Dingane became King of the Zulus in 1828 after taking part in the murder of this king, his own brother

SOLUTION: shaka

PROBLEM: Category: MARTIN VAN BUREN 
Clue: Martin lost his bid for a 2nd term as president to this man in the "Log Cabin And Hard Cider" campaign

SOLUTION:
william henry harrison