It is generally accepted by historians and researchers in literary genres in Gujarati literature that the earliest writings in this very ancient language were by Jaina authors. These were composed in the form of Rāsas, Phāgus and Vilāsas. Rāsas were long poems which were essentially heroic, romantic or narrative in nature. Śālībhadra Sūri's "Bharateśvara Bāhubalī rāsa" (1185 AD), Vijayasena's "Revantagiri-rāsa" (1235 AD), Ambadeva's "Samararasa" (1315 AD) and Vinayaprabha's "Gautama Svāmi rāsa" (1356 AD) are the most illustrious examples of this form of literature in Gujarati. The chief subjects of Rasas were descriptions of nature, erotic depictions of seasons, Jain Acharyas and Tirthankaras, biographies of historic characters. The collections of these Rasas are currently preserved in Jain libraries of Patan, Ahmedabad, Jaisalmer and Khambhat.