Many festivals have religious origins and entwine cultural and religious significance in traditional activities. The most important religious festivals such as Christmas, Hanukkah, Diwali and Eid al-Adha serve to mark out the year. Others, such as harvest festivals, celebrate seasonal change. Events of historical significance, such as important military victories or other nation-building events also provide the impetus for a festival. An early example is the festival established by Ancient Egyptian Pharaoh Rameses III celebrating his victory over the Libyans.[9] In many countries, royal holidays commemorate dynastic events just as agricultural holidays are about harvests. Festivals are often commemorated annually.