Filius Augusti

Filius Augusti was an ancient Roman honorary title given to the eldest son of the Emperor, symbolizing his status as his father’s successor and a future ruler. The term, meaning "Son of the Emperor," recognized the young heir’s importance within the imperial family and often associated him with authority and continuity of the emperor’s lineage. While it did not necessarily confer formal political power, it was a significant symbolic title used in official documents and ceremonies to highlight his role as the designated heir.