ἐφ' ὅσον αὐτοῦ ἡ ὑπόστασις τῶν χρόνων ὑπῆρχεν → as long as his store of years lasted
ἰσχυρός, κρατερός, Hsch.
Α σθένος(κατά τον Ησύχ.) «ἰσχυρός, κρατερός».