Julius Caesar was stabbed to death today, on the Ides of March. You'd think calendars would be simple things but apparently not. The Roman calendar originally had only ten months. You can see a relic of this in the names of the last four months of the year, derived from the Latin words for 7, 8, 9 and 10. There were four 31 day months and the rest were 30 days. These were referred to as "full" and "hollow" respectively. The system left the remaining 50 odd days of the year as an unorganized "winter", although Licinius Macer's lost history apparently stated the earliest Roman calendar employed intercalation instead, and Macrobius claims the 10 month calendar was allowed to shift until the summer and winter months were completely misplaced, at which time additional days belonging to no month were simply inserted into the calendar until it seemed things were restored to their proper place. If this sounds disturbingly casual, it is. When the kingdom ...