Along with the Saiva Nayanmars, Vaishnava Alvars were also producing devotional hymns and their songs were collected later into the Four Thousand Sacred Hymns (Naalayira Divyap Prabhandham). The three earliest Alvars were Poygai, Pudam and Pey. Each of these wrote one hundred Venpas. Tirumalisai Alwar who was a contemporary of the Pallava Mahendravarman I wrote such works as Naanmugantiruvadiandadi. Tirumangai Alvar who lived in the 8th century CE was a more prolific writer and his works constitute about a third of the Diyaprabhandam. Periyalvar and his adopted daughter Andal contributed nearly 650 hymns to the Vaishnava canon. Andal symbolised purity and love for the God and wrote her hymns addressing Vishnu as a lover. The hymn of Andal which starts with Vaaranam Aayiram (One Thousand Elephants) tells of her dream wedding to Vishnu and is sung even today at Tamil Vaishnava weddings. Nammalvar, who lived in the 9th century, wrote Tiruvaimoli. It comprises 1,101 stanzas and is held in great esteem for its elucidation of the Upanishads. This corpus was collected by Nathamuni, around 950 CE and formed the classical and vernacular basis for Sri Vaishnavism. These Hymns Naalayira Divya Prabhandham is respected at par with Vedas by Sri Vaishnavites in sanctity and holiness and hence referred to as 'Dravida Vedam' (திராவிட வேதம்).