Fatto generale: 483 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 483 is the last 3-digit string in the decimal expansion of p.
Trivia: 483 is an uninteresting number.
Data storica: April 27th is the day in 1578 that Duel of the Mignons claims the lives of two favourites of Henry III of France and two favorites of Henry I, Duke of Guise.