Why did the british monarch lose hanover when Victoria was crowned?

Queen Victoria lost Hanover when she ascended to the British throne in 1837 because of the Salic Law, which prohibited female succession to the Hanoverian throne. Upon the death of her uncle, King William IV, Victoria became queen of the United Kingdom, but Hanover passed to her male cousin, Ernest Augustus, Duke of Cumberland. This separation highlighted the different succession laws governing the British and Hanoverian crowns. Thus, while she ruled over Britain, she could not claim Hanover due to these legal stipulations.