staving R A Brown:
>During the Hellenistic period, the aspirated voiceless plosives were
>shifting to voiceless fricatives, while the voiced plosives (as I have
>said above) were shifting to voiced fricatives. These changes seem to have
>become general by the 4th cent CE and were certainly the Byzantine
>pronunciation and remain the modern pronunciation.
Presumably the aspirate => voiceless fricative sound change went through an
affricate stage, eg
[t_h] => [th] => [tT] => [T]
Is there any evidence of the affricate stage?
Pete