During what period was the calendar originated?
In which period was the timetable initially devised?
In what period did the schedule come into existence?
In what period did the schedule initially invented?
In which period did the agenda firstly envisioned?
During what period did the calendar initially devised?
In what period did the schedule inception?
In what period was the calendar arise for the
first time?
The History of the Advent Calendar I Oxford Open Learning
