In place of these devices of rams, which, because they are now so frequent, are in less esteem, a machine is made, well known to the historians, which we Greeks call helepolis.20 It was through the constant employment of this engine that Demetrius, the son of King Antigonus, after taking Rhodes and other cities gained the name of Poliorcetes.21 11 It is built in the following manner: a huge mantle