“ Soon after his elder brother became king as Edward IV. in March 1461, he was created duke of Clarence, and his youth was no bar to his appointment as lord-lieutenant of Ireland in the following year. Having been mentioned as a possible husband for Mary, daughter of Charles the Bold, afterwards duke of Burgundy, Clarence came under the influence of Richard Neville, earl of Warwick, and in July 1469 was married at Calais to the earl’s elder daughter Isabella. With his father-in-law he then acted in a disloyal manner towards the king. ”

“ Having been named as his father’s representative in England in 1345 and again in 1346, Lionel was created earl of Ulster, and joined an expedition into France in 1355, but his chief energies were reserved for the affairs of Ireland. ”

“ A violent quarrel between the brothers ensued, but Clarence was unable to prevent Gloucester from marrying, and in 1474 the king interfered to settle the dispute, dividing the estates between his brothers. In 1477 Clarence was again a suitor for the hand of Mary, who had just become duchess of Burgundy. Edward objected to the match, and Clarence, jealous of Gloucester’s influence, left the court. At length Edward was convinced that Clarence was aiming at his throne. The duke was thrown into prison, and in January 1478 the king unfolded the charges against his brother to the parliament. ”