Explanation:

Bhakti movement was a spontaneous movement and there are two views on its origin. First view is that it originated in Tamil Nadu during the seventh century and then spread through Karnataka, Maharashtra and spread in almost all parts of Northern / Eastern India by 15th century. In Tamil Nadu, the movement was started by Vaishnava saints {Alvars} and Shaiva saints {Nayanars}. The Alvars sang praises of Vishnu as the moved from place to place. They established shrines such as Srirangam and spread the ideas of Vaishnavism. The compilation of their poems called Divya Prabandham developed into a powerful literature of Vaishnavas. The Alvars emphasized on Bhakti and gave reference to Bhagvata Puranas often, they were called the pioneers of Bhakti Movement. The same is applicable to the Saiva Nayanar poets. They travelled from places to places and sang songs in praise of Lord Shiva. The compilation of their songs called Tirumurai, developed into the scripture on Shaivism. Both the Vishnu and Shiva bhakti saints influenced north India and this Bhakti Movement spread from South to North.