Α tentative reading:
Μάρκος Τ. ἀδελφός καὶ Markos, brother (of Titus?) and
[τρό]φιμος σο..υνε trophimos, [ ]
… σοὶ τόνδε τύμ- for you this tomb,
βον, ὦ καλὴ Κορίνθια, O beautiful Corinthian woman,
Α Δ·Ι·Νον. ἐτεύξαν . [date?] built
μόρῳ μνήμης [χάρ-] as a monument to your fate.
μόνους ἰδού Behold, only
εἰκοσι Σ. μία twenty-one (?)
κύκλους ἐν revolutions (= years) in
Ἄιδι σκε… Hades [
-θε τὴν κ[αλὴν] ] the beautiful
Κορίνθ[ιαν] Corinthian woman.
We hope that someone with a better epigraphical sense can elucidate the details. Clearly, however, the edifice was originally a tomb of the late Roman period. The inscriptions commemorate the premature death of a woman of Corinth. I'm not sure of the significance for her of the mirror and tablet. Beauty and literacy? Or could the "mirror" be actually the sistrum of Isis?
Excellent photos, Trkyem! Where exactly is the tomb located?