The Bhakti movement indeed originated in South India around the 7th-10th centuries with the Alvars and Nayanars and spread to the north later. It flourished in North India from the 15th to 17th centuries. Surdas, a prominent figure in the Krishna bhakti tradition, is traditionally considered a disciple of Vallabhacharya. However, Kabir Das was a contemporary saint, often associated with Ramananda or independent thought, and not a disciple of Surdas.