Catholic Encyclopedia (1913)/Ancient of Days
Ancient of Days, a name given to God by the Prophet Daniel, vii, 9, 13, 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 Atîq yômin; in the Greek Septuagint by παλαιὸς ἡμερῶν; and in the Vulgate by Antiquus dierum.
A. J. Maas.