language was employed in several official records and transactions (at the level of the Chera Perumal kings as well as the upper-caste (Nambudiri) village temples). Most of the inscriptions in Old Malayalam were found from the northern districts of Kerala, those lie adjacent to Tulu Nadu. Old Malayalam was mostly written in Vatteluttu script (with Pallava/Southern Grantha characters). Old Malayalam had several features distinct from the contemporary Tamil, which include the nasalisation of adjoining sounds, substitution of palatal sounds for dental sounds, contraction of vowels, and the rejection of gender verbs. Ramacharitam and Thirunizhalmala are the possible literary works of Old Malayalam found so far. Middle Malayalam Old Malayalam gradually developed into Middle Malayalam (Madhyakaala Malayalam) by 13th century CE. Malayalam literature also completely diverged from Tamil literature during this period. Works including Unniyachi Charitham, Unnichiruthevi Charitham, and Unniyadi Charitham, are written in Middle Malayalam, and date back to 13th and 14th centuries of Common Era. The Sandesha Kavyas of 14th century CE written in Manipravalam language include Unnuneeli Sandesam. Kannassa Ramayanam and Kannassa Bharatham by Rama Panikkar of the Niranam poets who lived between 1350 and 1450, are representative of this language. Ulloor has opined that Rama Panikkar holds the same position in Malayalam literature that Edmund Spenser does in English literature. The Champu Kavyas written by Punam Nambudiri, one among the Pathinettara Kavikal (Eighteen and a half poets) in the court of the Zamorin of Calicut, also belong to Middle Malayalam. The literary works of this period were heavily influenced by Manipravalam, which was a combination of contemporary Malayalam and Sanskrit. The word Mani-Pravalam literally means Diamond-Coral or Ruby-Coral. The 14th-century Lilatilakam text states Manipravalam to be a Bhashya (language) where "Malayalam and Sanskrit should combine together like ruby and coral, without the least trace of any discord". The scripts of Kolezhuthu and Malayanma were also used to write Middle Malayalam, in addition to Vatteluthu and Grantha script those were used to write Old Malayalam. The literary works written in Middle Malayalam were heavily influenced by Sanskrit and Prakrit, while comparing them with the modern Malayalam literature. Modern Malayalam The Middle Malayalam was succeeded by Modern Malayalam (Aadhunika Malayalam) by 15th century CE. The poem Krishnagatha written by Cherusseri Namboothiri, who was the court poet of the king Udaya Varman Kolathiri (1446–1475) of Kolathunadu, is written in modern Malayalam. The language used in Krishnagatha is the modern spoken