If a person such as Henry was married legitimately to another such as Catherine of Aragon, no new marriage could be contracted while both spouses survived. If the marriage was NOT legitimate (as Henry claimed since Catherine had been merely betrothed to his elder brother Arthur which he petitioned the Vatican to disregard since Arthur had died before Henry's marriage), then Henry was eligible to marry Ann Boleyn. Unfortunately for Henry, however, he claimed that Ann Boleyn had committed adultery against him and so he ordered her beheaded and so she was. That amounts to murdering one's spouse (if their marriage was legitimate at all) and would violate Canon Law (no exceptions for philandering monarchs claiming that adultery against them is "treason") which says that the murdering spouse can NEVER again marry legitimately. AND, let us not forget that Nicholas Sandler, a contemporary biographer of Henry the nonstop Lustful and serial spouse, claimed that Ann Boleyn was also the illegitimate daughter of Henry the patron monarch of STDs. That means that Lizzie I (who solemnly promised Mary that Lizzie I would reign as a Catholic but was an enemy of Holy Mother the Church which put a price on her head for it) was also never the legitimate monarch.
God had an answer to all this. Neither Edward nor Lizzie I left any offspring and the Tudor Dynasty died in 1603.
BTW, my wife is a relatively penniless descendant of Edward III through his last son, John of Gaunt.