The Roman Conquest

This close association with Armenia brought upon the country an invasion (65 BC ) by the Roman general Pompey, who was then at war with Mithradates VI of Pontus, and Armenia; but Rome did not establish her power permanently over Iberia. Nineteen years later, the Romans again marched (36 BC) on Iberia forcing King Pharnavaz II to join their campaign against Albania.^[7]

During this time Armenia and Pontus were actively expanding at the expense of Rome, taking over its Eastern Mediterranean possessions.

However, the success of the anti-Roman alliance did not last long. As a result of the brilliant Roman campaigns of Pompey and Lucullus from the west, and the Parthian invasion from the south, Armenia lost a significant part of its conquests by 65 BC, devolving into a Roman-Parthian dependency. At the same time, the Kingdom of Pontus was completely destroyed by the Romans and all its territory including Colchis were incorporated into the Roman Empire as her provinces.

The former Kingdom of Colchis became the Roman province of Lazicum ruled by Roman legati. The following 600 years of Georgian history were marked by the struggle between Rome and Persia (Iran) including Parthians and Sassanids who were fighting long wars against each other for the domination in the Middle East including Syria, Mesopotamia, Armenia, Albania, and Iberia.

In the late 4th century, Rome had to give up Albania and most of Armenia to Sassanid Persia. The province of Lazicum was given a degree of autonomy that by the end of the century developed into full independence with the formation of a new Kingdom of Lazica-Egrisi on the territories of smaller principalities of the Zans, Svans, Apsyls, and Sanyghs. This new Western Georgian state survived more than 250 years until 562 when it was absorbed by the Byzantine Empire.

While the Georgian kingdom of Colchis was administered as a Roman province, Caucasian Iberia freely accepted the Roman Imperial protection. A stone inscription discovered at Mtskheta speaks of the 1st-century ruler Mihdrat I (AD 58–106) as "the friend of the Caesars" and the king "of the Roman-loving Iberians." Emperor Vespasian fortified the ancient Mtskheta site of Arzami for the Iberian kings in 75 AD.

In the 2nd century AD, Iberia strengthened her position in the area, especially during the reign of King Pharsman II who achieved full independence from Rome and reconquered some of the previously lost territories from declining Armenia.

In the 3rd century AD, the Lazi tribe came to dominate most of Colchis, establishing the kingdom of Lazica, locally known as Egrisi. Colchis was a scene of the protracted rivalry between the Eastern Roman/Byzantine and Sassanid empires, culminating in the Lazic War from 542 to 562.^[8]

Early Middle Ages

With their status of "King of Kings" (Shahanshah),^[9] Armenian kings authority also carried over to the neighboring states of Georgia, Caucasian Albania and several of the Arab emirates.^[10]

Middle Ages

The second half of the 11th century was marked by the strategically significant invasion of the Seljuq Turks, who by the end of the 1040s had succeeded in building a vast nomadic empire including most of Central Asia and Persia. In 1071, the Seljuq army destroyed the united Byzantine and Georgian forces in the Battle of Manzikert. By 1081, all of Armenia, Anatolia, Mesopotamia, Syria, and most of Georgia had been conquered and devastated by the Seljuqs. By the end of the 1080s, Georgians were outnumbered in the region by the invaders. The defeat of the Bagratuni dynasty ended Christian leadership of Armenia for the next millennium.

The struggle against the Seljuq invaders in Georgia was led by the young King David IV Bagrationi (reigning 1089–1125). Georgians freed Shirvan and a large portion of Armenia. Thus in 1124 David also became the King of Armenians, incorporating Northern Armenia into the lands of the Georgian Crown. In 1125 King David died, leaving Georgia with the status of strong regional power.

The temporary fall of the Byzantine Empire in 1204 to the Crusaders left Georgia as the strongest Christian state in the whole East Mediterranean area. Muslim power in Greater Armenia was seriously troubled by the resurgent Georgian monarchy. Many local nobles (nakharars) joined their efforts with the Georgians, leading to liberation of several areas in northern Armenia, which was ruled, under the authority of the Georgian crown, by the Mkhargrdzeli, a prominent Armeno-Georgian noble family.

Provinces of the Russian Empire

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Transcaucasian Federation (1917–1918)

During the Russian Revolution, the provinces of the Caucasus seceded and formed their own federal state called the Transcaucasian Federation. Competing national interests and war with Turkey led to the dissolution of the republic half a year later, in April 1918.

Georgian–Armenian War (1918)

During the final stages of World War I, the Armenians and Georgians had been defending against the advance of the Ottoman Empire. In June 1918, in order to forestall an Ottoman advance on Tiflis, the Georgian troops had occupied former districts of Tiflis Governorate, the Lori Province which at the time had a 97% Armenian majority. After the Armistice of Mudros and the withdrawal of the Ottomans, the Georgian forces remained. Georgian Menshevik parliamentarian Irakli Tsereteli offered that the Armenians would be safer from the Turks as Georgian citizens. The Georgians offered a quadripartite conference including Georgia, Armenia, Azerbaijan, and the Mountainous Republic of the Northern Caucasus in order to resolve the issue which the Armenians rejected. In December 1918, the Georgians were confronting a rebellion chiefly in the village of Uzunlar in the Lori region. Within days, hostilities commenced between the two republics.^[12]

The Georgian–Armenian War was a border war fought in 1918 between the Democratic Republic of Georgia and the Democratic Republic of Armenia over the parts of then disputed province of Lori.

As Soviet republics

As independent states

On March 17, 1991, Armenia, along with the Baltics, Georgia and Moldova, boycotted a union-wide referendum in which 78% of all voters voted for the retention of the Soviet Union in a reformed form.^[17]

Georgia declared independence on 9 April 1991 and Armenia did the same on 21 September 1991 following the failed Soviet coup attempt in August. The United States recognized the independence of both nations on December 25, 1991.

Armenian-Georgian relations in the post-independence period have been mixed but cooperative. The two states are both allied with the other one's adversaries (Armenia with Russia, Georgia with Azerbaijan and Turkey)^{[citation needed]}, but they are nevertheless obliged to maintain cooperative ties: the border blockades imposed by Turkey and Azerbaijan on Armenia makes Georgia (and, via a single route, Iran) the only possible exit and entry point for Armenian imports and exports.

Recent revelations indicate that Yerevan had taken steps to assure Tbilisi that it had Armenia's all-but-official support in the outbreak of the 2008 South Ossetian and Abkhazian conflict. Armenia offered itself as a safe haven for Georgians escaping the conflict, and at one point, temporarily housed at least 500 Georgian families escaping the war. To this day, Armenia has not recognized South Ossetia and Abkhazia as independent states. However, the establishment of diplomatic relations between Abkhazia, South Ossetia, and the separatist Republic of Artsakh has drawn criticism from the Georgian government, notably during President Salome Zourabichvili's visit to Armenia in March 2019. Moreover, the Armenian Apostolic Church's decision to place Armenian churches in Abkhazia under the jurisdiction of its South Russian Eparchy instead of the Church's Eparchy of Georgia was rescinded after a meeting between President Zourabichvili and Catholicos Karekin II.^{[citation needed]}

According to Wikileaks, however, Armenia's foreign diplomats grew increasingly frustrated with Tbilisi's inability to respond to calls or diplomatic cables from Yerevan.^[18] Despite their reluctance to warmly embrace each other diplomatically, the differences between the two nations are more often highlighted by political rather than social or historical differences.

Positive steps have been taken to strengthen ties between the two nations. In January 2011, Georgian President Mikhail Saakashvilli paid an official visit to Armenia immediately after his initial visit to Washington. Both the Georgian and Armenian presidents seem to hold each other in high esteem, and Georgia's push to remove itself from the Russian sphere of influence in the Caucasus Region has translated to an increase of cooperation, positivity and productivity in relations with its immediate neighbors. Tbilisi recently made an effort to address the socioeconomic plight of the Georgian-Armenians living in Javakheti, a source of tension between the two nations, by building a main road that connects the region with Tbilisi as well as proposing new projects in the region, one of which involves the creation of a national park.