Nazca Lines created
In the desert of southern Peru, the Nazca and earlier cultures create enormous geoglyphs on the ground, best seen in full from above.
In the desert of southern Peru, the Nazca and earlier cultures create enormous geoglyphs on the ground, best seen in full from above.
Teotihuacan in the Valley of Mexico grows into one of the largest cities in the world of its time, with the Pyramid of the Sun and the Avenue of the Dead.
Maya city-states such as Tikal, Palenque and Calakmul reach their height in architecture, writing, astronomy and calendrics.
The Soninke Ghana Empire (Wagadu) flourished in what is now Mauritania and Mali, growing rich from control of the trans-Saharan gold and salt trade.
Constantine defeats Maxentius near Rome; according to tradition he saw a Christian sign before the battle.
Emperors Constantine and Licinius agree on religious toleration, ending the persecution of Christians in the Roman Empire.
Chandragupta I takes the throne, beginning the Gupta era, often regarded as a golden age of Indian science, art and literature.
The first ecumenical council of Christianity, convened by Constantine, condemns Arianism and formulates the Nicene Creed.
King Ezana of Aksum, in present-day Ethiopia and Eritrea, adopted Christianity under the influence of Frumentius, making Aksum one of the first Christian states.
Emperor Constantine I dedicates Constantinople as the new capital of the Roman Empire.
The Nubian Kingdom of Kush, whose capital Meroë was famed for ironworking and pyramids, came to an end around the mid-4th century amid campaigns by Aksum.
The Goths, many of whom had crossed the Danube fleeing the Huns, crush a Roman army and kill Emperor Valens.
Emperor Theodosius I proclaims Nicene Christianity the state religion of the Roman Empire.
After the death of Theodosius I, the empire is divided between his two sons into Western and Eastern halves, never to be reunited.