The two groups of Tamil devotional (Bhakti) saint-poets of South India between roughly the 6th and 9th centuries CE, the Alvars devoted to Vishnu and the Nayanars devoted to Shiva, who launched the early Bhakti movement.
The Alvar (Vishnu, twelve) versus Nayanar (Shiva, sixty-three) distinction, their texts (Divya Prabandham and Tevaram), and their role as the earliest Bhakti movement in the Tamil south are standard culture facts.
Alvars worship Vishnu and number twelve; Nayanars worship Shiva and number sixty-three; both are Tamil, early (6th to 9th century), and precede the north Indian Bhakti saints by centuries.
Tamil Bhakti saint-poets: Alvars (12, Vishnu, Divya Prabandham) and Nayanars (63, Shiva, Tevaram).