Muḥarram is the first month of the Islamic calendar. It is one of the four sacred months of the year. Since the Islamic calendar is a lunar calendar, Muharram moves from year to year when compared with the Gregorian calendar.The word “Muharram” means “forbidden”. It is held to be the second holiest month, following Ramadan. Some Muslims fast during these days. The tenth day of Muharram is the Day of Ashura, which to Shia Muslims is part of the Mourning of Muharram.