Malayalam calendar
The Malayalam Calendar is a sidereal solar calendar used in Kerala. The origin of the calendar has been dated to 825 CE, the beginning of the Kollam Era.There are many theories regarding the origin of the era, but according to recent scholarship, it commemorated the foundation of Kollam after the liberation of the southern Chera kingdom (known as Venadu) from the Chola dynasty's rule by or with the assistance of the Chera emperor at Kodungallur. The origin of the Kollam Era has been dated to 825 CE, at the end of the three year-long great convention in Kollam held at the behest of the Venadu King Kulasekharan. Scholars from west and east were present in the convention, and the Tamil Kanakku (Calendar) was adopted. Kollam was the capital of Venadu and an important port town of the Chera Kingdom in that period.