A few days before his death, Constantine I was baptized by the Arian bishop Eusebius of Nicomedia, although he had planned to be baptized in the waters of the Jordan River like Jesus.
Constantine was more than 40 years old when he finally declared himself a Christian, making it clear that he owed his successes only to the protection of the Christian God. He supported the church financially, built basilicas, granted privileges to the clergy (including exemption from certain taxes), promoted Christians to high offices, and returned property confiscated during the persecutions.
Among his most famous works are Basilica of the Holy Sepulchre and the Old Basilica of St. Peter. Constantine made every effort to build it on the resting place of St. Peter, and the total construction time was more than 30 years.
