Two of the three Malayalam triumvirate poets, Ulloor S. Parameswara Iyer and Kumaran Asan are from Thiruvananthapuram. Annual literature festivals like the Kovalam Literary Festival, are held in the city. Literary development is further aided by state institutions such as the State Central Library, one of the oldest public libraries in India, which was established in 1829, and other major libraries including the Thiruvananthapuram Corporation Central library, and the Kerala University Library. Thiruvananthapuram has been a hub of classical music since the days of Maharaja of Travancore, Swathi Thirunal. Thiruvananthapuram is known for many music festivals like the Navarathri Music Festival, one of the oldest festivals of its kind in South India, Swathi Sangeethotsavam, Soorya Music fest, Neelakanta Sivan Music Fest and many other music festivals are organised by various cultural groups. The 111-day-long Soorya Festival is the biggest art and cultural event in Kerala. The Soorya Festival features film festivals, theatre festivals, dance, music, painting and photography exhibitions.