Fait général: 4200 is the number of standard size of a legion in the Roman Republic.
Fait mathématique: 4200 is divisible by its reverse.
Culture générale: 4200 is the number of standard size of a legion in the Roman Republic.
Date historique: July 1st is the day in 69 that Tiberius Julius Alexander orders his Roman legions in Alexandria to swear allegiance to Vespasian as Emperor.