ῥητροφύλαξ
From LSJ
ὁ χρόνος ἐστὶ δάνος, τὸ ζῆν πικρός ἐσθ' ὁ δανίσας → time is a loan, and he who lent you life is a hard creditor | time is on loan and life's lender is a prick
English (LSJ)
[ῠ], ᾰκος, ὁ, A keeper of archives, Phot., Suid., EM703.46.
Greek (Liddell-Scott)
ῥητροφύλαξ: [ῠ], -ακος, ὁ, ὁ φύλαξ τῶν ἀρχείων, ἀρχειοφύλαξ, Φώτ., κλ.