Information about the Armenian-Indian relations can be found in the works of Xenophon (from 4th to 5th centuries BCE), Zenob Glak (4th century BCE), Movses Khorenatsi (5th century), Procopius of Caesarea (6th century). The first Armenian communities in India were formulated in the 15th -16th centuries; in the 17th-18th centuries, when multiple Iranian-Armenians settled in 20 cities and trading centers of India, the communities became bigger (around 20-25 thousand people).