Old Welsh

Old Welsh is the early stage of Welsh language, developed into Mid Welsh in 1100. The preceding period, from the time Welsh became distinct from Old Briton around 550, has been called "Primitive" or "Archaic Welsh".

Phonology
The phonology of Old Welsh is as follows.
+Consonant phonemesLabialDentalAlveolarPalatalVelarGlottalNasalStopFricative Approximant  Lateral
+Vowel phonemesFrontCentralBackClose Mid Open

 Older  was diphthongized into  in (stressed) final syllables, but it was retained elsewhere. Whilst this persisted as a diphthong in Middle Welsh, in Modern Welsh /aw/ has collapsed to  following the stress shift to the penultimate, except in monosyllables.
  and  were allophones of  and  in unstressed non-final syllables. In Middle Welsh these merged to .
 Old Welsh  and  became  and  in Modern Welsh final syllables, in dialects where /ɨ/ has not merged with /i/.

References

Category: Celtic languages