In the Roman Catholic Church, white is associated with Jesus Christ, innocence and sacrifice. Since the Middle Ages, priests wear a white cassock in many of the most important ceremonies and religious services connected with events in the life of Christ. White is worn by priests at Christmas, during Easter, and during celebrations connected with the other events of the life of Christ, such as Corpus Christi Sunday, and Trinity Sunday. It is also worn at the services dedicated to the Virgin Mary, and to those Saints who were not martyred, as well as other special occasions, such as the ordination of priests and the installation of new bishops. Within the hierarchy of the church, the lighter the color, the higher the rank. Ordinary priests wear black; bishops wear violet, cardinals wear red, and outside a church, only the Pope will wear white.  Popes occasionally wore white in the Middle Ages, but usually wore red. Popes have worn white regularly since 1566, when Pope Pius V, a member of the Dominican Order, began the practice. White is the color of the Dominican Order.
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