The Roman calendar provides the basis for what our calendar is today. Caesar invented this calendar in 45 B.C., and since then it has been greatly modified. The ides of March, the middle of the month was the day that Caesar was killed. Possibly the conspirators wanted to get him back by using his system of days to mark a day for which to execute their plan. Maybe the plan was just useful. And it was. People today believe that the Roman calendar did not make any sense, but it really did. To mark the first and last days, and then mark three points in between those days was a very smart thing. This way they would know when certain events were coming up, and when it was close to the months ending. The numbering of the days is a little confusing however, because how would one number three days after the Nones (nine days before the Ides)? The hours made more sense, because the Romans didn’t even bother to hassle with daylight savings time, they just numbered the hours according to the amount of daylight there was. This system may not make sense to some now, but in it’s time it must have been considered revolutionary, and possibly a little strange. We are so used to the concept of time and deadlines now, but back then, when the calendar was first introduced, the concept of it must have been a bit frightening as well.