The Sangam literature historically known as 'the poetry of the noble ones' connotes the early classical Tamil literature and is the earliest known literature of South India. The Tamil tradition and legends link it to three legendary literary gatherings around Madurai and Kapāṭapuram: the first lasted over 4,440 years, the second over 3,700 years, and the third over 1,850 years. Scholars consider this Tamil tradition-based chronology as ahistorical and mythical. Most scholars suggest the historical Sangam literature era, also called the Sangam period, spanned from c. 300 BCE to 300 CE, while others variously place this early classical Tamil literature period a bit later and more narrowly but all before 300 CE. According to Kamil Zvelebil, a Tamil literature and history scholar, the most acceptable range for the Sangam literature is 100 BCE to 250 CE, based on the linguistic, prosodic and quasi-historic allusions within the texts and the colophons.

Vishnu, also known as Narayana and Hari, is one of the principal deities of Hinduism. He is the supreme being within Vaishnavism, one of the major traditions within contemporary Hinduism.