William, the Conqueror had four sons with his wife Matilde of Flanders: Robert II, Duke of Normandy, Richard, William II and Henry I, in OTL Richard ended up dying in a hunting accident in the New Forest, when he collided with a branch pending, probably in 1070 or shortly after, most Robert, William and Henry lived to adulthood. An interesting thing to note is that all of William's children took a long time to get married and have children (in the case of William II he never married), my idea is that between 1070 and 1087 William's children ended up dying, leaving without male heirs at his death in 1087. What would be the effects of this? Would some of William's daughters inherit the throne or would we have a new dynasty crisis ala 1066?