Keywords: lambaesis groma principia legionary fortress woodcut blackandwhite monochrome outdoor black and white Nineteenth-century woodcut by A. Kohl showing the Groma (often known as The Praetorium) in front of the principia at Lambaesis. Looking NE Nineteenth-century woodcut by A. Kohl showing the Groma (often known as The Praetorium) in front of the principia at Lambaesis. Looking NE |