Answer - The two most famous conquistadors were Hernán Cortés who conquered the Aztec Empire and Francisco Pizarro who led the conquest of the Incan Empire.
When Queen Elizabeth says this, she is asserting that she has the same qualities and abilities to lead a country as a king does. Whether this is courage, leadership skills, a love for one's country, or wisdom, Queen Elizabeth is basically stating that queens are no less qualified to rule countries than kings. Hope this helps.
