The only Roman emperor's scepter to have been found has gone on public display in Rome for the first time.

The scepter, which is topped by a blue orb that represents the earth, was discovered at the end of last year and is believed to have been held by Emperor Maxentius, who ruled for six years until 312AD.

Maxentius, who was known for his vices and his incapacity, drowned in the Tiber while fighting forces loyal to his brother-in-law, Constantine, at the battle of the Milvian Bridge. Archaeologists believe that Maxentius' supporters hid the scepter during or after the battle to prevent it from falling into enemy hands.