Arcadius, Emperor of the Eastern Roman Empire, proclaims his nine months old son, Theodosius, co-Augustus on January 10, 402 AD, a title for co-emperor.
When Arcadius died on May 1, 408 AD, Theodosius became the sole ruler of the Eastern Roman Empire at the age of seven as Theodosius II. A regency was established, Initially, under the Praetorian Prefect Anthemius to govern the empire because of his age.