Thrissur Pooram is a yearly Hindu sanctuary celebration held in Kerala, India. It is held at the Vadakkunnathan Temple in Thrissur reliably on the Pooram day. The day when the moon ascends with the Pooram star in the Malayalam Calendar month of Medam. It is the greatest and most mainstream of all poorams. 

Prior to the beginning of Thrissur Pooram, the biggest sanctuary celebration in Kerala was the one-day celebration held at Aarattupuzha known as Arattupuzha Pooram. Sanctuaries in and around the city of Thrissur were general members. Multi day as a result of ceaseless downpours, they were late for the Arattupuzha Pooram and were denied access to the Pooram parade. Feeling humiliated by the refusal, the temples[clarification needed] went to the Sakthan Thampuran and recounted their story. 

In 1798, he brought together the 10 sanctuaries arranged around Vadakkunnathan Temple and sorted out the festival of Thrissur Pooram as a mass celebration. He welcomed sanctuaries with their gods to the city of Thrissur to pay deference to Lord Vadakkunnathan (Lord Siva), the directing divinity of the Vadakkunnathan Temple.