Classical Armenian ( grabar, meaning "literary"; also Old Armenian or Liturgical Armenian) is the oldest attested form of the Armenian language. It was first written down at the beginning of the 5th century, and all Armenian literature from then through the 18th century is in the Grabar Armenian language. Many ancient Greek, Persian, Hebrew, Syriac, and Latin manuscripts survive only in their Armenian translation. Classical Armenian continues to be the liturgical language of the Armenian Apostolic Church and is often learned by Biblical, Intertestamental, and Patristic scholars dedicated to textual studies. Classical Armenian is also important for the reconstruction of the Proto-Indo-European language, since it preserves many archaic features.
(ա), (ի), or schwa (ը), or open e (ե), or closed e (է), (ո), and (ու)(transcribed as a, i, ə, e, ē, o, and u respectively). The vowel transcribed u is spelled using the Armenian letters for ow (ու), but is not actually a diphthong.
There are also traditionally six diphthongs:
ay (այ), aw (աւ, later օ), ea (եա), ew (եւ), iw (իւ), oy (ոյ).