William John Cavendish-Scott-Bentinck, 5th Duke of Portland, styled Lord John Bentinck before 1824 and Marquess of Titchfield between 1824 and 1854, was a British Army officer and peer, most remembered for his eccentric behaviour. A recluse who preferred to live in seclusion, he had an elaborate underground maze excavated under his estate at Welbeck Abbey near Clumber Park in North Nottinghamshire.

Welbeck Abbey is an English mansion situated in the village of Welbeck, which is within the civil parish of Norton, Cuckney, Holbeck and Welbeck, in the Bassetlaw District of Nottinghamshire. It was the site of a monastery belonging to the Premonstratensian order in England and after the Dissolution of the Monasteries, a country house residence of the Dukes of Portland. It is part of the Dukeries, four contiguous ducal estates in North Nottinghamshire. The house is a Grade I listed building.