Originally called Byzantium and later Constantinople, which city officially took its current name in 1930?

At Christmas 1965, which British band reached No. 1 in the U.S. with "Over and Over," its only American chart-topper? At the Council of Clermont in 1095, Pope Urban II proclaimed the first of which holy wars? In 1999, which star's gown, worn to serenade JFK in 1962, sold for about $1.3 million, then a record for a dress? Which world-famous medical center, founded by a doctor and his two sons, is based in Rochester, Minnesota? Which famed astronomer served as Britain's Astronomer Royal from 1720 until his death in 1742? In "Hamlet," which character says "Good night, sweet prince" at Hamlet's death? At her 100th birthday celebration in 1960, which folk artist danced a jig with her doctor? At her 1953 coronation, which monarch wore special gold bracelets representing sincerity and wisdom?