Moving the capital of the empire to Byzantium (modern-day Istanbul).
If the file is a modern documentary or lecture, it likely covers the life of , the first Roman Emperor to convert to Christianity. Key topics usually addressed in such videos include: Costantino_Il_Grande.mp4
His decisive defeat of rival Maxentius in 312 AD, which solidified his rule over the Western Roman Empire. Moving the capital of the empire to Byzantium