The Ecclesiastical History Of Scholasticus by Socrates Scholasticus
Chapter XXXIX.--The Emperor falls sick and dies.
A year having passed, the Emperor Constantine having just entered the sixty-fifth year of his age, was taken with a sickness; he therefore left Constantinople, and made a voyage to Helenopolis, that he might try the effect of the medicinal hot springs which are found in the vicinity of that city. Perceiving, however, that his illness increased, he deferred the use of the baths; and removing from Helenopolis to Nicomedia, he took up his residence in the suburbs, and there received Christian baptism. After this he became cheerful; and making his will, appointed his three sons heirs to the empire, allotting to each one of them his portion, in accordance with the arrangements he had made while living. He also granted many privileges to the cities of Rome and Constantinople; and entrusting the custody of his will to that presbyter by whose means Arius had been recalled, and of whom we have already made mention, he charged him to deliver it into no one's hand, except that of his son Constantius, to whom he had given the sovereignty of the East. After the making of his will, he survived a few days and died. Of his sons none were present at his death. A courier was therefore immediately despatched into the East, to inform Constantius of his father's decease.