Fait mathématique: 1303 is the number of multigraphs with 7 vertices and 8 edges.
Culture générale: 1303 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: July 26th is the day in 1509 that the Emperor Krishnadeva Raya ascends to the throne, marking the beginning of the regeneration of the Vijayanagara Empire.