Some of the earliest bhakti movements were led by the Alvars and Nayanaras. They travelled from place to place singing hymns in Tamil in praise of their gods. During their travels, the Alvars and Nayanars identified certain shrines as abodes of their chosen deities. Very often large temples were later built at these sacred places. These developed as centres of pilgrimage. Some historians suggest that the Alvars and Nayanars initiated a movement of protest against the caste system and the dominance of Brahmanas or at least attempted to reform the system.

What is the meaning of the word "alvars" in relation to South India?

Those who are “immersed” in devotion to Vishnu.

Some of the earliest bhakti movements (c. sixth century) were led by the Alvars (literally, those who are “immersed” in devotion to Vishnu) and Nayanars (literally, leaders who were devotees of Shiva). They traveled from place to place singing hymns in Tamil in praise of their gods.