BEAUVOIR, ROGER DE, the nom de plume of EUGENE AUGUSTE ROGER DE BULLY (1809-1866), French writer, was born in Paris. The son and nephew of public officials who did not ap prove his literary inclinations, he wrote over the signature of Roger de Beauvoir. He astonished all Paris with his ostentatious luxury and his adventures, while his romantic novels gave him a more serious, if not durable, reputation. Among the best of them are L'Ecolier de Cluny ou le Sophisme (1832), which is said to have furnished Alexandre Dumas and Theodore Gaillardet (1808- 1882) with the idea of the Tour de Nesle, and Le Chevalier de Saint Georges (1840). He had married in 1847 an actress, Eleonore Leocadie Doze (1822-1859), from whom he obtained a judicial separation a year or two later, after a long and notorious trial, following which his mother-in-law got him imprisoned for three months and fined 500 francs for a satirical poem, Mon Proces (1849). Ruined by extravagance, and tied to his chair by gout, he died in Paris on Aug. 27, 1866.