A name given to God by the Prophet Daniel (7:9, 7:13, 7:22), in which he contrasts His eternal powers with the frail existence of the empires of the world. It is from these descriptions of the Almighty that Christian art derived its general manner of representing the first person of the Holy Trinity. Ancient of Days is expressed in Aramaic by Atiq yomin; in the Greek Septuagint by palaios hemeron; and in the Vulgate by Antiquus dierum.
The Catholic Encyclopedia, Volume I. Published 1907. New York: Robert Appleton Company. Nihil Obstat, March 1, 1907. Remy Lafort, S.T.D., Censor. Imprimatur. +John Cardinal Farley, Archbishop of New York