The Duke of Clarence became King William IV in 1830, by which point Conroy felt very confident of his position; his control of the household was secure. The Duchess prevented her daughter from attending William's coronation out of a disagreement of precedence, a decision attributed by the Duke of Wellington to Conroy. By then, it had become clear to Victoria that she would succeed to the throne. The new king and queen attempted to gain custody of their niece, but Conroy quickly replied that Victoria could not be "tainted" by the moral atmosphere at court. Conroy solidified the stance that mother and daughter could not be separated, and continued to promote the Duchess' virtue as a fit regent.