Emperor Nintoku vs Licinius

Emperor Nintoku's reign is traditionally dated from 313 to 399 AD and is considered a period of stability and prosperity for the Yamato state. He is credited with expanding agricultural infrastructure and consolidating the imperial line's authority.

Emperor Nintoku is said to have ordered the construction of irrigation canals and rice paddies to boost agricultural output. These projects are recorded in the Nihon Shoki as having alleviated famine and strengthened the economic base of the Yamato court.

Emperor Nintoku commissioned the construction of the Daisen Kofun in Sakai, Osaka, the largest keyhole-shaped burial mound in the world. The tomb measures 486 meters in length and is surrounded by three moats, reflecting the immense power and resources of the Yamato state.

Licinius met Constantine in Milan and agreed to a policy of religious toleration for Christians. The agreement, known as the Edict of Milan, granted freedom of worship throughout the Roman Empire.

Licinius was defeated by Constantine at the Battle of Cibalae in Pannonia. The loss forced Licinius to cede most of the Balkan provinces to Constantine, significantly weakening his position as co-emperor.

Constantine decisively defeated Licinius at the Battle of Chrysopolis near Chalcedon. Licinius surrendered and was initially spared, but was later executed on charges of plotting rebellion, ending the Tetrarchy.