Whose legendary paladins included Rinaldo and Roland?

Among whose 355 patents was an 1887 one for ballistite, a smokeless powder? Which singer's four Top 40 hits in 1967 included "Kentucky Woman"? Which author's historical novels include "Burr" and "1876"? Which president's nicknames included "Gloomy Gus" and "Tricky Dick"? Which Harlem Renaissance poet published the collection "Shakespeare in Harlem" in 1942? Which fashion designer's purses and shoes often carry his initials, MK? The New York Times won a 1987 Pulitzer for coverage of which 1986 space tragedy, which cited serious design flaws? A medical museum displays the leg that General Daniel Sickles lost at which July 1863 battle?