The seventh son of a seventh son is a concept from folklore regaring special powers given to, or held by, such a son. The seventh son must come from an unbroken line with no female children born between, and be, in turn, born to such a seventh son. The number seven has a long history of mystical and religious associations: seven sleepers, seven-league boots, seven ages of man, seven hills of Rome, seven lucky gods of Japanese mythology, the Seven Sages, seven sisters, seven stars, seven wonders of the world, and so on. In this case, it refers to a man who is the seventh son of a man who is himself a seventh son.