In addition to the feasts of saints in the Roman (Latin) calendar, The Dominican Order observes a calendar of their own saints and blesseds.  Many of the Dominican Saints appear in the Roman Calendar: St. Dominic, St. Catherine of Siena, St. Thomas Aquinas, St. Rose of Lima, St. Martin DePorres, St. Albert the Great, St. Pius V, and others.  Memorials of the saints and blesseds are commemorated in the Mass and the Divine Office in Dominican churches, convents and monasteries.