Sambanthar was a 7th-century child poet-saint who died at the age of 16 in 655 CE. His verses were set to tune by Nilakantaperumalanar who is set to have accompanied the poet on his "yal" or lute. The first three volumes of Tirumurai contain 383 hymns. Appar (alias Tirunavukkarasar) was born in the middle of the 7th century in Tiruvamur, Tamil Nadu, and lived about 81 years. He converted to Jainism as a youth, became the head of a Jain monastery over time, but then returned to Shaivism. Tirumurai contains 313 hymns of Appar over volumes 4-7. His hymns are highly devotional, with some containing criticism of Jainism as he experienced it. Sundarar (alias Sundaramurthi) was born towards the end of the 7th century. He is the author of 100 hymns compiled as the 7th "Tirumurai".