What is associated with: by 1300 these slav conquering knights were the most powerful force in central eastern europe?

Based on the clue 'bwana means sir in this african language', what is the answer? What is associated with: by 1018 emperor basil the bulgar slayer had put the balkan peninsula under this empires contro… What is associated with: by 1096 the holy roman empire stretched from italy to this peninsula that makes up most of den… What is associated with: by 1300 amman had disappeared it was resettled by this empire in 1878 grew from there? What is associated with: by 1513 da vincis patron was giuliano a member of this powerful florentine family? What is associated with: by 1519 he ruled over an empire of more than 5 million in central southern mexico? What is associated with: by 1665 the new haven colony was absorbed by this colony? What is associated with: by 1795 this great ruler had united most of his people founded his new island kingdom?