The history of Thrissur District from the 9th to the 12th centuries is the history of Kulasekharas of Mahodayapuram and the historysince 12th century is the history of the rise and growth of Perumpadappu Swarupam. In the course of its long and chequered history, the Perumpadappu Swarupam had its capital at different places.
We learn from the literary works of the period that the Perumpadappu Swarupam had its headquarters at Mahodayapuram and that a number of Naduvazhies in Southern and Central Kerala recognized the supremacy of the Perumpadappu Moopil. The Perumpadappu Moopil is even referred to as the "Kerala Chakravarthi" in the "Sivavilasam" and some other works. One of the landmarks in the history of the Perumpadapu Swarupam is the foundation of a new era called Pudu Vaipu Era. The Pudu Vaipu Era is traditionally believed to have commenced from the date of which the island of Vypeen was thrown from the sea.