The Roman calendar originally had March as the first month. July was the fifth month. It was originally called Quintilis, the name being derived from their word for fifth (quintus ). It was renamed after Julius Caesar in 44BC. August, then the sixth month, was originally Sextilis, derived from sextus, 'sixth'. It was renamed in 8BC after Augustus, the first of their emperors. The Julian calendar, still being used in England in the 18th Century was introduced by Julius Caesar to rectify serious errors in and simplify the format of the current Roman calendar. It seemed only right that he should take some credit , recognized by the name of a month.