In 17th of June 1944 the Kingdom of Iceland was declared a republic. June 17th was chosen as the official holiday because it was the birthday of Jón Sigurðsson, who is regarded as Iceland's leader in the campaign for independence in the 19th century. The greatest celebrations are held in Reykjavík with parades, street theatres, sideshows and dancing, but throughout the country the day is filled with picnics and various organized festivities as well.