Trajan's column was erected to commemorate the successful campaigns of the Emperor against the Dacians of the Danube frontier (the ancestors of contemporary Romania) in AD 101-2 and 105-6. It stood at the focal point of the Emperor's Forum in Rome http://www.vam.ac.uk/content/articles/t/trajans-column/
Trajan's column, is a Roman triumphal column that commemorates Roman emperor Trajan's victory in the Dacian Wars. It is considered to be the masterpiece of Roman sculptural art. It was dedicated to Trajan by Hadrian.