Πτολεμαίος

You can put it in google translate to hear a modern greek version of it. The P sound is there but nearly silent.

https://translate.google.com/?sl=el&tl=en&text=%CE%A0%CF%84%CE%BF%CE%BB%CE%B5%CE%BC%CE%B1%CE%AF%CE%BF%CF%82&op=translate

@lvxferre @procrastitron in Koine Greek, vowel length* and vowel diphthongs had already practically ceased as a feature (iotacism was already in progress during Koine Greek). Most vowels and vowel combinations were pronounced almost exactly as they are pronounced in modern Greek (with notable exception to οι and υ, which were closer to [y] than modern [i]. That was the last change to happen in Greek pronunciation and it happened rather late; [y] was still present as a phoneme in medieval Greek).

The other difference to modern Greek pronunciation was also that the voiced stops (β, δ, γ) hadn't become fricatives yet, that change was complete in medieval greek.

Πτολεμαίος in Koine Greek would be pronounced exactly the same as in modern Greek ([pto.le.'me.os])

* Small fun fact: Vowel length still exists in modern Greek, but it is used for stressing vowels; an unstressed vowel is short and a stressed vowel is "semilong" (along with having a higher volume and a different pitch). In fact, you can tell where a word is stressed *just* by the length of the stressed vowel, without the change in pitch and volume.