The headword phrase (which literally means 'far of the nights') is perhaps extracted from the quotation given, though there is a much earlier instance in Plato, Symposium 217D (quoted by Phrynichus and Timaeus).
[1] An approximation of Procopius, Secret History 12.20 (web address 1), on demonic phenomena associated with the emperor Justinian (cf. iota 446 generally); cf. Kaldellis (59). Further entries on Justinian's purportedly demonic nature are alpha 1259, delta 806, epsiloniota 225, iota 726, and pi 46.