William V and IV (1735-1756) was King of England, Scotland, and Ireland and Stadtholder of the Netherlands from his father's death in 1749 until his own death in 1756. His great youth at the time of his coronation, and the fact that he died at only 21, allowed the parliament to continue to increase in power. He died without children, and was succeeded by his 8-year-old brother, who became Henry IX.