Traditional Sanskrit literary theory has always tried to distinguish kāvya,a term often translated as poetry, but actually subsuming all creative literature including prose romance, biography, and drama, from other linguistic expressions like treatises of knowledge systems (śāstra) and narratives (ākhyāna). Though the treatises related to the topic were written in Sanskrit, they addressed Prakrit poetry also, and Sanskrit drama was always multilingual. Literary theorists of India have speculated on a variety of topics related to the nature, aims, genre, and constituent elements of literature, the equipments necessary for a poet, various levels of meaning, and the nature of aesthetic response. In their attempt to distinguish kāvya from other linguistic expressions, they have also formulated various concepts like poetic figures, stylistic features, suggestiveness, aesthetic emotion, propriety, and the like that they deem to be exclusive to poetry. Indian theorists took into account both the creative and receptive aspects of literature and the notion of the ideal reader is inherent in the discussions of poetry. Literary theory also armed itself with the insights it received from philosophical systems in dealing with the problems related to verbal cognition and aesthetic experience. The Kāvyālaṅkāra of Bhāmaha (6th century), the Kāvyādarśa of Daṇḍin (7th century), the Kāvyālaṅkārasārasamgraha of Udbhaṭa (8th century), the Kāvyālaṅkāasūtravṛtti ofVāmana (8th century),the Kāvyālaṅkāra of Rudraṭa (9th century), the Dhvanyāloka of Ānandavardhana (9th century), the Kāvyamīmāmsā of Rājaśekhara (10th century), Vakroktijīvita of Kuntaka (10th century), the Locana commentary on Dhvanyāloka and theAbhinavabhāratī commentary on Nāṭyaśāstra of Abhinavagupta (11th century), the Vyaktiviveka of Mahimabhaṭṭa (11th century), the Kāvyaprakāśa of Mammaṭa (11th century), the Sāhityadarpaṇa of Viśvanātha (14th century), the Sarasvatīkaṇṭābharaṇa and Śṛṅgāraprakāśa of Bhoja (11th century),the Citramīmāmsā of Appayya Dīkṣita (16th–17th century), and the Rasagaṅgādhara Jagannātha Paṇḍita (17th century) are some of the seminal works in Indian literary theory.