Rabi' al-awwal (ربيع الأوّل) is the third month in the Islamic calendar. During this month, Muslims around the world celebrate Mawlid - the birthday of the Islamic prophet Muhammad. Sunni Muslims believe the exact date of birth of Muhammad to have been on the twelfth of this month, whereas Shi'a believe him to have been born on the dawn of the seventeenth day. The name Rabī‘ al-awwal means the first [month]/beginning of spring, referring to its position in the pre-Islamic Arabian calendar before the practice of intercalation was abolished.