Here's my theory... Every 7 hundred years, humanity goes through a transition; Usually led by someone, who is remembered as the 'Agent of Change'... Many, many years later... And act as a catalyst, for an evolutionary next step, in human development...
Here's my List: Moses[inspiration of Old Testament] King David[inspiration of Psalms] Yeshuam bin Joseph[inspiration of New Testament] Mo-Ham-meeed[inspiration of Koran] Leonardo[inspiration of Renaissance] Barack Obama[inspiration for people globally]