In which period did the agenda originated?
When was the calendar initially established?
In which period did the calendar emerge?
During what period did the calendar originally devised?
In which period was the calendar initially conceived?
At what time did the schedule initially introduced?
In what period did the calendar inception?
When was the agenda come about for the first time?
In which period did the agenda originated?
When was the calendar initially established?
In which period did the calendar emerge?
During what period did the calendar originally devised?
In which period was the calendar initially conceived?
At what time did the schedule initially introduced?
In what period did the calendar inception?
When was the agenda come about for the first time?
