Keezhperoor, which was the capital of Ay Kingdom and later Venad dynasty. During the Ay periode the place was known as Periyaoor, later divided into kizhperiyaoor and Melperiyaoor. Thirupalkadal Sreekrishnaswamy Temple was the family temple of Ay kingdom and Venad dynasty which is believed to be 2000 years old. The evidence regarding the existence of keezhperoor and Thirupalkadal Sreekrishnaswamy Temple is in different copper plates and is available from 843 AD.
Keezhperoor monarchs of Venad Dynasty (till 16th century)
Rama Varma Kulashekhara (1090–1102); mentioned in Rameswarathukoil Inscription as the founder of Venad as an independent state.
Kotha Varma Marthandam (1102–1125); conquered Kottar and Nanjanad from the Pandya Dynasty.