<P> Between the 1st and 3rd centuries , the Roman Empire gradually replaced the eight - day Roman nundinal cycle with the seven - day week . Our earliest evidence for this new system is a Pompeiian graffito referring to the 6th February ( viii idus Februarius ) of the year AD 60 as dies solis ( `` Sunday '' ) . Another early witness is a reference to a lost treatise by Plutarch , written in about AD 100 , which addressed the question of Why are the days named after the planets reckoned in a different order from the actual order ? . </P>
<P> Between the 1st and 3rd centuries , the Roman Empire gradually replaced the eight - day Roman nundinal cycle with the seven - day week . Our earliest evidence for this new system is a Pompeiian graffito referring to the 6th February ( viii idus Februarius ) of the year AD 60 as dies solis ( `` Sunday '' ) . Another early witness is a reference to a lost treatise by Plutarch , written in about AD 100 , which addressed the question of Why are the days named after the planets reckoned in a different order from the actual order ? . </P>
who invented the days of the week names
who invented the days of the week names
Roman Empire
Roman Empire