'St. James' Palace', 1924. St James's Palace in Westminster, London is the most senior royal palace in the United Kingdom. Built by King Henry VIII on the site of a leper hospital dedicated to Saint James the Less, the palace was secondary in importance to the Palace of Whitehall for most Tudor and Stuart monarchs. The palace increased in importance during the reigns of the early Georgian monarchy, but was displaced by Buckingham Palace in the late-18th and early-19th centuries.