Note 006 Euseb. in Vit Constant. 1. iv. c. 61, 62, 63. The legend of Constantine's baptism at Rome thirteen years before his death, was invented in the eighth century, as a proper motive for his donation. Such has been the gradual progress of knowledge, that a story, of which Cardinal Baronius (Annal. Ecclesiast. A.D. 324, No. 43-49) declared himself the unblushing advocate, is now feebly supported, even within the verge of the Vatican. See the Antiquitates Christianae, tom. ii. p. 232 - a work published with six approbations at Rome, in the year 1751, by Father Mamachi, a learned Dominican .

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Note to Chapter 20 of DECLINE & FALL by Gibbon