Thrissur Pooram Festival - Kerala Tourism History of Thrissur Pooram - The Cochin Maharaja, Sakthan Thampuran was the first person who wished to conduct Thrissur Pooram. At once, Aarattupuzha which became the largest festival of Kerala, with the arrival of Thrissur Pooram, Aarattupuzha festival get less importance. Due to heavy rain, Aarattupuzha Pooram