1) Collapsible shelter 2) Praetorium 3) Tent 1) Praetorium 
• (n.) The official residence of a governor of a province; hence, a place; a splendid country seat. • (n.) The general`s tent in a Roman camp; hence, a council of war, because held in the general`s tent.
Pre·to'ri·um noun [ Latin praetorium , from praetor .] 1. The general's tent in a Roman camp; hence, a council of war, because held in the general's tent. 2. The official residence of a governor of a province; hence, a place; a splendid country seat.