Queen Elizabeth II and King John III are not direct relatives, as King John III was a fictional character and does not actually exist in the historical records of British royalty. However, if we consider historical connections, Queen Elizabeth II is a descendant of King John of England, who reigned from 1199 to 1216. King John is known for signing the Magna Carta, but he is not directly linked to a King John III.
The British royal family is known for its complex lineage, and over the centuries, various dynasties and branches have intertwined through marriages and alliances. Queen Elizabeth II belongs to the House of Windsor, and she is distantly related to many historical figures through a web of royal connections. Thus, while there is no direct relationship with a King John III, Queen Elizabeth II’s ancestry does connect back to several historical monarchs, including King John.