The Sangam literature (300 BCE - 400 CE), written in the Sangam period, is a mostly secular body of classical literature in the Tamil language. Nonetheless, there are some works, significantly Pattupathu and Paripaatal, wherein the personal devotion to God was written in the form of devotional poems. Vishnu, Shiva and Murugan were mentioned gods. These works are therefore the earliest evidence of monotheistic Bhakti traditions, preceding the large bhakti movement, which was given great attention in later times.