How she made her Will, and died at the Age of Eighty Years
And when at length at the close of a long life, she was called to inherit a happier lot, having arrived at the eightieth year of her age, and being very near the time of her departure, she prepared and executed her last will in favor of her only son, the emperor and sole monarch of the world, and her grandchildren, the Cæsars his sons, to whom severally she bequeathed whatever property she possessed in any part of the world. Having thus made her will, this thrice blessed woman died in the presence of her illustrious son, who was in attendance at her side, caring for her and held her hands: so that, to those who rightly discerned the truth, the thrice blessed one seemed not to die, but to experience a real change and transition from an earthly to a heavenly existence, since her soul, remoulded as it were into an incorruptible and angelic essence, was received up into her Saviour's presence.
Source: Life of Constantine (New Advent)