At what time did the schedule devised?
In which period did the calendar first devised?
In which period was the agenda come into existence?
When was the agenda firstly invented?
In which period was
the schedule firstly thought up?
When was the timetable firstly established?
At what time was
the calendar inception?
In what period was the agenda come about for the first time?
The History Of Advent Calendars The Fact Site
