The discovery of the “True Cross” is related with many marvellous particulars by Socrates, Eccles. Hist. i. 17; and Sozomen, E. H. ii. 1.  A portion was said to have been left by Helena at Jerusalem, enclosed in a silver case; and another portion sent to Constantinople, where Constantine privately enclosed it in his own statue, to be a safeguard to the city.  Eusebius, Life of Constantine, iii. 25–30 , gives a long account of the discovery of the Holy Sepulchre, but makes no mention of the Cross.  Cyril seems to have been the first to record it, 25 years after.  Cf. Greg. Nyss. Bapt. Christi (p. 519).