Poonthanam Namboothiri & Melpathur Narayana Bhattathiri

Poonthanam (1547-1640AD) was a famous devotee of Guruvayurappan, who lived in Keezhattoor in Malappuram district. He was a famous devotee of Lord Krishna (Guruvayurappan). He is remembered for his masterpiece, Jnanappana which means 'the song of wisdom' in Malayalam. Poonthanam was the family name, his personal name is not known.
He married at 20, but for a long time, they had no children. He began to propitiate the Lord of Guruvayur by reciting the ‘Santhana Gopalam ’ and a son was born. He called for a celebration and everybody known was invited, but the child died an hour before the Annaprasanam ceremony. Grief stricken, Poonthanam sought refuge at Guruvayur and started praying with the puranic story of Kumaraharanam.

He was a contemporary of Melpathur Narayana Bhattathiri(1559–1645), another famous poet associated with Guruvayur. He was a mathematical linguist (vyakarana). His most important scholarly work, Prakriya-sarvawom(പ്രക്രിയ സർവ്വവം), sets forth an axiomatic system elaborating on the classical system of Panini. However, he is most famous for his masterpiece, Narayaneeyam, a devotional composition in praise of Guruvayoorappan (Sri Krishna) that is still sung at the temple of Guruvayoor.

Thanks & Source: http://en.wikipedia.org/wiki/Poonthanam