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.^[1][2][3]

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.^[4] 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. Kollam Aandu was adapted in the entire Chera Kingdom (the contemporary states of Tamil Nadu, Karnataka, and Kerala), the majority of which is now in Kerala. In Malayalam-speaking Kerala, it is now called the Malayalam Era or 'Kollavarsham’ (Kollam Thontri Aandu). The earliest available record mentioning the Kollam Era is a royal decree by Sri Vallavan Goda, the King of Venadu, dated to c. 973 CE (Kollam Era 149). In the inscription, the phrase "Kollam Thontri Aandu" is employed.^[5] Another era, referred to as "Kollam Aḻintha Aandu", counting from 1097 CE, was reckoned by the Cholas for some time. It is tentatively calculated that the Chola overlords captured the port of Kollam in 1097 CE.^[5]