sentences:  A large wave of Armenian settlers in the country's capital city of Tbilisi took place in the 12th-13th centuries, especially after 1122, in the aftermath of liberation of the Caucasus from Seljuk Turks by Georgian and Armenian forces under the leadership of King David IV and Tamar of Georgia.In the 18th and 19th centuries, Armenian merchants, including famous jewelers and oil industrialists invested heavily in business in Georgia and helped build trading houses, cultural centers, schools and churches.The number of Armenians increased progressively such that by the early 19th century, the Armenians far outnumbered Georgians in the capital city of Tbilisi.