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Horthus Malabaricus, the book that lists the medicinal herbs of Kerala, is the first printed book in Malayalam. Itti Achuthan Vaidyar is the co-author of the book with the Dutch Governor, Henric Vaan Reid. Keralarama, is the original book by Itti Vaidyar, from which the materials for Horthus Malabaricus was taken.
He was a Vaidya in the 17th century.