Έχω μια απορία, ποιος και πως προσδιόρισε ότι τα ερείπια είναι ρωμαϊκά, αφού η επιγραφή είναι ελληνική (ΚΑΙ ΔΑ ΔΗ ΠΑΤΡΙ), όπως πολύ καθαρά φαίνεται στην εικόνα;
Logical question, Ion! "Roman ruins" is just archaeologists' jargon for "ruins from the Roman period," the period to which this architectural member (arch) and the letter forms belong. In other words, it's from some part of the Roman empire (probably Asia Minor), and from the early centuries C.E.
At first I thought the visible part might say ΔΑιΔΗ ΠΑΤΡΙΑ, "ancestral torches," but the word δαΐς is feminine, so can't have a neuter plural form; and the letter after ΠΑΤΡΙ is probably Λ, not A. So ΔΑΔΗ could possibly be a native Anatolian name, masculine, in the dative case: "to his father Dades"?