In what
period did the calendar originated?
During what period was the agenda first introduced?
In which period was the timetable come into existence?
In what period was the timetable originally invented?
In which period was the calendar firstly envisioned?
When was the agenda initially introduced?
In what period did the calendar creation?
During
what period was the timetable come about for the first time?
Who Invented the Calendar A History of the Calendar
