At the time of their marriage, William was not heir-presumptive to the throne, but became so when his brother Frederick, Duke of York, died childless in 1827. Given the small likelihood of his older brothers producing heirs, and William's relative youth and good health, it had long been considered extremely likely that he would become king in due course. In 1830, on the death of his elder brother, George IV, William acceded to the throne. One of King William's first acts was to confer the Rangership of Bushy Park (for 33 years held by himself) on Queen Adelaide. This act allowed Adelaide to remain at Bushy House for her lifetime.