Claim: Beau Brummell's downfall became more pronounced after Brummell, Lord Alvanley, Henry Mildmay, and Henry Pierrepont (dubbed "the Dandy Club" by Byron) jointly hosted a masquerade ball at Watier's private club.
Evidence: This changed in July 1813, at a masquerade ball jointly hosted at Watier's private club by Brummell, Lord Alvanley, Henry Mildmay and Henry Pierrepont. The incident marked the final breach in a rift between Brummell and the Regent that had opened in 1811, when the Prince became Regent and began abandoning all his old Whig friends. The four were considered the prime movers of Watier's, dubbed "the Dandy Club" by Byron.