1900 Birthday Theodosius Dobzhansky, born in Ukraine, genetist/writer, Mankind Evolving 450 Death Theodosius II de Jongere, emperor Austrian Empire, dies 421 Event Eudocia A Athenais marries Oostromeins emperor Theodosius II 401 Birthday Theodosius II, the Younger, Eastern Roman emperor 395 Death Theodosius I, the Great, Spanish emperor of Rome, dies at 49 392 Event Emperor Theodosius declares christian religion, state religion 390 Event Roman emperor Theodosius admits debt on mass murder in Thessalonica 388 Event Battle at Aquileja: Emperor Theodosius beats emperor Magnus Maximis 379 Event Theodosius installed as co-emperor of East Roman Empire
