I agree. The distinction I was trying to make was between the title Regent and Prince Regent. The circumstances of George IV becoming Prince Regent were singular, as he was acting as king during his father's incapacity. With regard to Victoria, her mother was appointed regent. King William IV disliked her so much that he said publicly that his one ambition was to live until Victoria reached the age of 18, so that the Duchess of Kent would never become regent. He made it with a month to spare.