Mediolanum

City · c. 395–402 CE · in Europe

Capital of Western Roman Empire (395–402).

Ravenna (c. 395 CE): Capital of Western Roman Empire (395–476), Ostrogothic Kingdom (500–553).
Zhangye (c. 397 CE): Capital of Northern Liang (397–439).
Soba (400–1504 CE): Capital of Alodia (600–1504).
Faras (c. 400–650 CE): Capital of Nobatia (400–650).
Turkistan (401 CE): Capital of Kazakh Khanate (1599–1729).
Lanzhou (c. 387 CE): Capital of Western Qin (387–431).
Pingcheng District (c. 387 CE): Capital of Northern Wei (387–533).
Gyeongju (c. 378 CE): Capital of Silla (378–681), Unified Silla (682–892).
Braga (c. 414 CE): Capital of Kingdom of the Suebi (414–585), Kingdom of Galicia (911–1125).
Jiankang (c. 426 CE): Capital of Liu Song Dynasty (426–479), Southern Qi (480–502), Chen Dynasty (561–589).

Around the same time and place

Augustine of Hippo (354 CE – 430 CE): Theologian and bishop of Hippo Regius in Roman North Africa whose works, including the Confessions and The City of God, shaped Western Christianity.
Sack of Rome (410) (410 CE): The Visigoths under Alaric sacked Rome, the first time in eight centuries that the city had fallen to a foreign enemy.
Statue of Zeus at Olympia (c. 435 BCE – c. 425 CE): Giant gold-and-ivory seated statue of Zeus by Phidias in his temple at Olympia, one of the Seven Wonders of the Ancient World; lost in the fifth century CE.
Trier (16 BCE – 1618 CE): Capital of Electorate of Trier (1333–1618).
Migration of the Visigoths (376–418 CE): Goths fleeing the Huns crossed the Danube into the Roman Empire in 376, defeated the Romans at Adrianople in 378, and under Alaric sacked Rome in 410, before settling in Aquitaine in 418.
Battle of Adrianople (378 CE): Goths defeated the Eastern Roman army and killed Emperor Valens near Adrianople, a major blow to Roman military power.
Attila (c. 406 CE – 453 CE): Ruler of the Huns who led devastating invasions of the Eastern and Western Roman Empires from his base on the Hungarian plain.
Venice (c. 421 CE): Traditionally founded in 421, Venice grew on lagoon islands into a maritime republic that dominated trade between Europe and the East.