Mathematical fact: 1054 is a value of n for which |cos(n)| is smaller than any previous integer.
Trivia: 1054 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: November 19th is the day in 1095 that the Council of Clermont, called by Pope Urban II to discuss sending the First Crusade to the Holy Land, begins.