Laval 29.12.1799 at Lanesborough's / 19.1.1800 again
Perhaps Anne Alexandre &c, duc de Laval, 1747-1817 will PCC 1817 marshal of France 1783, who was certainly in England in August 1799 as the Oracle of 14.8.1799 reported his departure for Switzerland with his two sons, one of whom, Anne Pierre Adrien 1767-1837, succeeded him as duke and would have been styled marquis de Laval at the time (Hoefer, Nouvelle Biographie Generale). There are biographies of father and son in Adolphe Robert's Dictionnaire des Parlementaires Francais which I haven't yet seen