ἐφ' ὅσον αὐτοῦ ἡ ὑπόστασις τῶν χρόνων ὑπῆρχεν → as long as his store of years lasted
ἀρχίθεος, -ον (Α)αυτός που ήταν θεός από την αρχή, ο αιώνιος θεός.