Temples

The temple was built at the time of Perumthachan from Parayi petta panthirukulam. It is said that Perumthachan lived during the second century; so the Koothambalam may be more than 1,600 years old. According to Malayalam historian V. V. K. Valath, the temple was a pre-Dravidian Kavu (shrine). In the early days, Paramekkavu Bhagavathi was also situated inside the Vadakkunnathan temple. Subsequently, a new temple was built outside and the idol of the goddess was moved to that location. For comparison, Koodalmanikyam Temple, Kodungallur Bhagavathy Temple and Ammathiruvadi Temple, Urakam are older than the Vadakkunnathan temple, according to temple documents. Some suggest that there have also been influences from Buddhist and Jain temples.

Yogiatiripppads
The Nambudiris who were entrusted with looking after temple affairs were called Yogiatiripppads. When Nambudiris gained control of the region, the temple also came under their domain. The Yogiatiripppads were elected from Thrissur desam. Prior to Sakthan Thampuran's reign, the Yogiatiripppad system declined. Later, the Maharaja of Cochin gained presiding authority over the temple.

Adi Shankara
Adi Shankara is believed to have been born (788 AD) to Shivaguru and Aryamba of Kalady consequent to their prayers to lord Vadakkumnathan, as amsavatara of Shiva. The couple devoutly prayed for 41 days at the temple. Legend has it that Shiva appeared to the couple in their dreams and offered them a choice. They could have either a mediocre son who would live a long life or an extraordinary son who would die early. Both Shivaguru and Aryamba chose the latter. In honour of Shiva, they named their son Shankara. According to legend, Adi Shankara attained videha mukti ("freedom from embodiment") at the Vadakkunnathan temple. One narrative as expounded by the Keraliya Shankaravijaya, identifies the temple as his place of death. He also established four Mutts at Thrissur, famously known as Edayil Madhom, Naduvil Madhom, Thekke Madhom and Vadakke Madhom

Invasion of Tipu Sultan
During the invasion of Tipu Sultan, the temple was not attacked by Tipu's Army. Even though Tipu Sultan destroyed many temples in Thrissur district at that time, he never touched Vadakkumnathan Temple. According to historical accounts, when Tipu Sultan was marching towards the Travancore lines, known locally as Nedumkotta, he had a short stay at Thrissur city from 14 to 29 December 1789. In order to feed his Army, he had borrowed cooking vessels from Vadakkumnathan Temple. Before leaving Thrissur city, he not only returned the vessels, but presented the temple with a large bronze lamp.Thouge it is completely contradicting since it is against his original nature. Historians have different tales about it without primary sorce as reference other than their own book and belief.

Zamorin of Calicut
During 1750 to 1762, the temple affairs were conducted by Zamorin of Calicut who attacked Thrissur city and took control of the temple and the city. In 1762 with the help of Kingdom of Travancore, Maharaja of Cochin regained control over Thrissur city and the temple.

Sakthan Thampuran
When Sakthan Thampuran (1751–1805), ascended the throne of Kingdom of Cochin, he changed the capital of Kingdom of Cochin from Thripunithura to Thrissur city as the King had a personal relationship with Vadakkumnathan Temple. He later cleared the teak forest around the temple and introduced the famous Thrissur Pooram festival. The King's personal interest in the temple also changed the fortune of the city.

Structure
The temple is situated on an elevated hillock in the centre of Thrissur City and is surrounded by a massive stone wall enclosing an area of nearly 9 acres (36,000 m2). Inside this fortification, there are four gopurams facing four cardinal directions. Between the inner temple and the outer walls, there is a spacious compound, the entrance to which is through gopurams. Of these, the gopurams on the south and north are not open to the public. The public enter either through the east or west gopuram. The inner temple is separated from the outer temple by a broad circular granite wall enclosing a broad corridor called Chuttambalam. Entrance into the inner temple is through a passage through the corridor.