古典ラテン語
Classical Latin had several diphthongs. The two most common were . was fairly rare, and were very rare, at least in native Latin words. There has also been debate over whether is truly a diphthong in Classical Latin, due to its rarity, absence in works of Roman grammarians, and the roots of Classical Latin words (i.e. to , to , etc.) not matching or being similar to the pronunciation of classical words if were to be considered a diphthong.