Fatto matematico: 1803 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 1803 is a boring number.
Data storica: December 7th is the day in 1724 that Tumult of Thorn – religious unrest is followed by the execution of nine Protestant citizens and the mayor of Thorn (Toruń) by Polish authorities.