After his death in 1923, it was revealed that which president had trysts with his mistress in the White House?

After his father, John the Fearless, was killed in 1419, Philip the Good became duke of which French wine region? After his daring April 1942 raid on Japan, which pilot and his crew bailed out over China? After his death in 1821, which poet was described by a fellow poet as so fragile he was killed off by one critique? After his death in 1885, whose body lay in state under the Arc de Triomphe? After his death in 1968, some of whose ashes were scattered on the California coast while the rest were buried in Salin… After his death in 1974, whose son Mercer took over his band? After his death in 1994 at age 81, which former president appeared on Time magazine's cover for a record 55th time? After whose death on January 21, 1924, did Stalin and Trotsky struggle for power in the USSR?