Henry VIII, King of England, is famous mostly for the fact that he was married so many times in hopes of getting a son. This is not, however, the reason why he is most important in historical terms. His divorces were related to his real reason for fame though. This is because his desire for divorce led to his break with the Roman Catholic Church.
Because the Pope would not grant him a divorce, Henry broke from the Catholic Church and created the Church of England. This was extremely important for two reasons. First, it made England (eventually) a Protestant country. This would have major geopolitical implications as England would now be an enemy to such Catholic countries as Spain. This religious difference is part of what brought on the attack of the Spanish Armada, for example. Second, it changed English society by destroying all of the monasteries of England. These religious institutions had been major economic, political, and social factors. By destroying them, Henry changed the fabric of English life radically.