Muharram is the opening month of the Hijra year. The 10th day of this month (May) is honoured by the Muslims of Kerala. As per belief, it was on this day that the Imam Hussain, the grandson of Prophet Mohammed, and his men were slain at Karbala.
It is to bemoan the martyrdom of the Imam that the Muslims observe Muharram. Fasting is an important ritual of this day.