Malayalam, the lingua franca of the Indian state of Kerala and the union territories of Lakshadweep and Puduchery, is one of the six classical languages of India. Malayalam literature comprises those literary texts written in Malayalam, a South-Dravidian language spoken in the Indian state of Kerala. The first travelogue in any Indian language is the Malayalam Varthamanappusthakam, written by Paremmakkal Thoma Kathanar in 1785. Malayalam literature has been presented with 6 Jnanapith awards, the second-most for any Dravidian language and the third-highest for any Indian language. The Sangam literature can be considered as the ancient predecessor of Malayalam. The origin of Malayalam calendar dates back to year 825 CE. It is generally agreed that the Quilon Syrian copper plates of 849/850 CE is the available oldest inscription written in Old Malayalam. The earliest known literary works in Malayalam are Ramacharitam (late 12th or early 13th century) and Thirunizhalmala, two epic poems written in Old Malayalam. In the subsequent centuries, besides a popular Pattu ("song") literature, the manipravalam poetry also flourished. Manipravalam (translates "ruby coral") style consisted of poetry in an admixture of Malayalam and Sanskrit. Then came works such as champus and sandeshakavyas in which prose and poetry were interspersed. Later, poets like Cherusseri introduced poems on devotional themes. Designated a "Classical Language in India" in 2013, Malayalam literature developed into the current form mainly by the influence of the poets Cherusseri Namboothiri, Thunchaththu Ezhuthachan, and Poonthanam Nambudiri, in the 15th and the 16th centuries of Common Era. Thunchathu Ezhuthachchan is also known as The father of modern Malayalam literature. Kunchan Nambiar, a poet of 18th century CE, also has contributed much to Malayalam literature in its early form. The Bharathappuzha river, also known as River Ponnani, and its tributaries, have played a major role in the development of modern Malayalam Literature.