I'll give you that Yorkie. Quarantine was first used in Dubrovnik (then called Ragusa) in 1377, at the time of the plague. There was a 40 day isolation of ships before entering the city - the 40 days comes from 'quaranta giorni', from the Venetian dialect - the city then belonged to the Venetian Republic. Modern ships Worldwide fly the 'Lima' flag (Yellow and Black) to indicate that a ship is under quarantine and later the 'Quebec' flag to indicate that the ship is free of contagion and can then enter a port, thought the time taken for this now varies. Over to you.