premise: Elizabeth of York married someone.
hypothesis: Elizabeth of York . As the wife of Henry VII , she was the first Tudor queen . She was the daughter of Edward IV and niece of Richard III , and she married the king following Henry 's victory at the Battle of Bosworth which started the last phase of the Wars of the Roses . Therefore , she was the daughter , sister , niece , wife , mother and grandmother of successive Kings of England . As a Yorkist princess , the final victory of the Lancastrian faction in the War of the Roses may have seemed a further disaster , but Henry Tudor knew the importance of Yorkist support for his invasion and promised to marry her before he arrived in England ; this was an important move , which , however , failed to bring him the desired Yorkist support . Her marriage seems to have been successful , though her eldest son Arthur , Prince of Wales , died at age 15 in 1502 , and three other children died young .