The Imperial Guard Barracks is a Late Middle Ages Military Building. It is where a player can train the Imperial Guard, the heavy unit of the age. It is the fourth unlocked military building of the age. In order to construct the Imperial Guard Barracks, a player needs to have unlocked the Pike Square technology.
It is recommended to build the Imperial Guard Barracks, as they are effective against the light unit of the age, the Great Sword Warrior. However, the improved range of the ranged unit of the age means the Imperial Guard cannot always retaliate against the Longbow Archer if hit by it.