Based on the clue 'castor has an apparent magnitude of 16 this star a...', what is the answer?

Which performer is associated with 'castle'? What is associated with: castles offered great protection until the 1400s when these large weapons came into use? Based on the clue 'castor pollux are the twin sons of this god', what is the answer? Based on the clue 'castor an ingredient in perfume comes from this bu...', what is the answer? Based on the clue 'castor pollux theseus accompanied jason on his jo...', what is the answer? Based on the clue 'castoroides giant beavers of the pleistocene grew ...', what is the answer? What is referred to by 'castro overthrows batista'? What is referred to by 'castro stalin lenin tito'?