When was the agenda devised?
During what period was the calendar first developed?
At what time did the calendar arise?
When did the timetable
firstly created?
During what period was the timetable firstly imagined?
When did the timetable initially devised?
In which period was the timetable inception?
In which period did the calendar emerge for the first time?
The History Of Advent Calendars The Fact Site
