Important festivals were at the same time as the major events of the agricultural calendar, including a harvest festival of thanksgiving. The Great Peacemaker (Deganawida) was their prophet. After the Europeans arrived, many Iroquois became Christians, among them Kateri Tekakwitha, a young woman of Mohawk-Algonkin parents. Traditional Iroquois religious beliefs became somewhat more popular again in the second half of the 18th century by the teachings of the Iroquois prophet Handsome Lake.