Proto-Armenian language in the context of "Comparative method"

Armenia, officially the Republic of Armenia, is a landlocked country in the Armenian highlands of West Asia. It is a part of the Caucasus region and is bordered by Turkey to the west, Georgia to the north, Azerbaijan to the east, and Iran and the Azerbaijani exclave of Nakhchivan to the south. Yerevan is the capital, largest city and financial center.

The Armenian highlands have been home to the Hayasa-Azzi, Shupria, and Nairi peoples. By at least 600 BC, an archaic form of Proto-Armenian, an Indo-European language, had diffused into the Armenian highlands. The first Armenian state of Urartu was established in 860 BC, and by the 6th century BC it was replaced by the Satrapy of Armenia. The Kingdom of Armenia reached its height under Tigranes the Great in the 1st century BC and in AD 301 became the first state in the world to adopt Christianity as its official religion. Armenia still recognises the Armenian Apostolic Church, the world's oldest national church, as the country's primary religious establishment. The ancient Armenian kingdom was split between the Byzantine and Sasanian Empires around the early 5th century. Under the Bagratuni dynasty, the Bagratid Kingdom of Armenia was restored in the 9th century before falling in 1045. Cilician Armenia, an Armenian principality and later a kingdom, was located on the coast of the Mediterranean Sea between the 11th and 14th centuries.

Shubria or Shupria was a kingdom in the southern Armenian highlands, known from Assyrian sources in the first half of the 1st millennium BC. It was located north of the upper Tigris River and to the southwest of Lake Van, extending eastwards to the frontiers of Urartu. It appears in the 1st millennium BC as an independent kingdom, succeeding the people earlier called Shubaru in Assyrian sources in the later centuries of the 2nd millennium BC. It was located between the powerful states of Assyria and Urartu and came into conflict with both. It was conquered by Assyria in 673–672 BC but likely regained its independence towards the end of the 7th century BC with the collapse of Assyrian power.

Some scholars have concluded from the Hurrian etymology of some Shubrian names that Shubria was mainly populated by Hurrians. Some have suggested that it was the last remnant of Hurrian civilization, or even constituted the original homeland of the Hurrians. However, other Shubrian names have been identified as Aramean by origin. Bradley J. Parker writes that the existing evidence indicates that Shubria had a heterogeneous population including Hurrians, Arameans, and likely also Urartians, Assyrians and others. According to some scholars, Shubria was inhabited, at least in part, by speakers of the Proto-Armenian language and played an important role in the formation of the later Armenian state and ethnic group.

Urartian or Vannic is an extinct Hurro-Urartian language which was spoken by the inhabitants of the ancient kingdom of Urartu (Biaini or Biainili in Urartian), which was centered on the region around Lake Van and had its capital, Tushpa, near the site of the modern town of Van in the Armenian highlands, now in the Eastern Anatolia region of Turkey. Its past prevalence is unknown. While some believe it was probably dominant around Lake Van and in the areas along the upper Zab valley, others believe it was spoken by a relatively small population who comprised a ruling class.

First attested in the 9th century BCE, Urartian ceased to be written after the fall of the Urartian state in 585 BCE and presumably became extinct due to the fall of Urartu. It must have had long contact with, and been gradually totally replaced by, an early form of Armenian.

As the Proto-Indo-European language (PIE) broke up, its sound system diverged as well, as evidenced in various sound laws associated with the daughter Indo-European languages.Especially notable is the palatalization that produced the satem languages, along with the associated ruki sound law. Other notable changes include:

• Grimm's law and Verner's law in Proto-Germanic
• an independent change similar to Grimm's law in Armenian, dubbed the Armenian Consonant Shift
• Adjarian's law in Proto-Armenian
• loss of prevocalic *p- in Proto-Celtic
• Brugmann's law in Proto-Indo-Iranian
• Winter's law and Hirt's law in Balto-Slavic
• merging of voiced and breathy-voiced stops, and /a/ and /o/, in various "northern" languages
• Sturtevant's law
• Cowgill's laws of Germanic and Greek
• Osthoff's law
• Slavic first, second and third ("progressive") palatalization

Bartholomae's law in Indo-Iranian, and Sievers's law in Proto-Germanic and (to some extent) various other branches, may or may not have been common Indo-European features. A number of innovations, both phonological and morphological, represent areal features common to the Italic and Celtic languages; among them the development of labiovelars to labial consonants in some Italic and Celtic branches, producing "p-Celtic" and "q-Celtic" languages (likewise "p-Italic" and "q-Italic", although these terms are less used). Another grouping with many shared areal innovations comprises Greek, Indo-Iranian, and Armenian; among its common phonological innovations are Grassmann's law in Greek and Indo-Iranian, and weakening of pre-vocalic /s/ to /h/ in Greek, Iranian and Armenian.