When in Rome,do as the Romans do.入乡随俗
the phrase "when in Rome,do as the Romans do" means that it is polite to follow the customs of a society when you are a visitor there.It can also be advantageous to follow the customs of a society.
The earliest printed reference to the way the phrase is said today is from 1777 printed in Interesting letters of Pope Clement XIV .
It says,"The siesto,or afternoon's nap of Italy,my most dear and reverend Father,would not have alarmed you so much,if you had recollected,that when we are at Rome,we should do as the Romans do - cum Romano Romanus eris."
While this might be the origin of the phrase as it is said today,it is not the origin of the phrase "when in Rome,do as the Romans do."
In 1621,Robert Burton wrote The Anatomy of Melancholy and included the line,"...like Mercury,the planet,are good with good,bad with bad.When they are at Rome,they do there as they see done,puritans with puritans,papists with papists."
In 1599,Henry Porter wrote the play,The pleasant history of the two angry women of Abington .He included the line,"Nay,I hope,as I have temperance to forbear drink,so have I patience to endure drink:Ile do as company dooth; for when a man doth to Rome come,he must do as there is done."
Neither of these are the origin,though.The origin can be found along with the questions "Why Rome?" and "Why Romans?"
It is because of the travels of St.Augustine.He wrote to St.Januarius that when he was in Rome,he fasted on Saturdays.However,when he was in Milan,he did not.He then asked St.Januarius if he followed the customs of the church that St.Januarius attended.
The shortened phrase that I am used to became popular in the 1930s.Charles Faber wrote a play called "When in Rome" that was performed in New York.
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