Today, in the 1962 Dominican Rite Calendar, we celebrate the feast of the illustrious St. Catherine of Siena, Virgin, Doctor of the Church, Patroness of the Third Order of St. Dominic. At the time the 1962 Dominican Breviary was published, her feast was II Class, though it could be celebrated as I Class by Tertiaries and Churches which bore her name. By the time of the publication of the English translations of the Breviarium S.O.P., the Order raised her feast to I Class. Accordingly, the festive office is prayed according to the rubrics.
From the Martyrology:
At Rome, St. Catherine of Siena, virgin, of the Order of our Father St. Dominic. While hardly more than an infant, she consecrated her virginity to Christ and preserved it unsullied until death. She was famed for her innumerable halos of virtue, and excelled in a remarkable innocence of life. Strengthened by Christ her Spouse in frequent sweet conversations, she merited to become a sharer in His sufferings and wounds. Lastly, she was distinguished by the gift of prophecy, by miracles, and by doctrine. Having frequently conquered and triumphed over Satan, she ascended to heaven to the happy embraces of her Spouse on April 29. She was buried in the Church of Santa Maria sopra Minerva, and Pius II inscribed her in the number of the holy virgins.
From “Short Lives of the Dominican Saints” (London, Kegan Paul, Trench, and Trübner & Co., Ltd., 1901):