Based on the clue 'bolsheviks kill the czar his family', what is the answer?

What is associated with: bologna stone found in 1603 was thought to be this alchemical stone to change cheaper metals i… Based on the clue 'bologna was originally called felsina by this grou...', what is the answer? Based on the clue 'bolon tzacab itzamna kukulcan known to other peopl...', what is the answer? What is referred to by 'bolshevik island'? Based on the clue 'bolt a man of principle defies a king', what is the answer? What is referred to by 'bomb backfield blitz'? Based on the clue 'bomb bullet blitz spearing sudden death are all t...', what is the answer? What is associated with: bombarded with some 4000 shells during a 34 hour stretch this fort surrendered to the south on…