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But the artwork's disappearance was only noted in 1957, when Mary Montagu Douglas Scott, Duchess of Buccleuch and Queensberry, visited one of Harvard University's galleries - and saw it on display.

The Portrait of Wolfgang Wilhelm of Pfalz-Neuburg was stolen in 1951 from Boughton House, the home of the Duke of Buccleuch and Queensberry.

It is unclear what the league would look like and who would compete in it, with most of boxing's biggest stars under contract with key promoters such as Eddie Hearn's Matchroom, Bob Arum's Top Rank and Frank Warren's Queensberry.

When Itauma's elder brother, Karol, signed with Frank Warren's Queensberry Promotions, it wasn't long before he did the same.

Fury and Usyk's promoters had very different ideas on how the fight should have been scored with the Queensberry chief backing the Briton.