Roman Martyrology in the context of "Penitent thief"

Catherine of Alexandria, also spelled Katherine, was, according to tradition, a Christian saint and virgin, who was martyred in the early 4th century at the hands of the emperor Maxentius. According to her hagiography, she was both a princess and a noted scholar who became a Christian around age 14, converted hundreds of people to Christianity, and was martyred around age 18.

The Eastern Orthodox Church venerates her as a great martyr and celebrates her feast day on 24 or 25 November, depending on the regional tradition. In Catholicism, Catherine is traditionally revered as one of the Fourteen Holy Helpers, and she is commemorated in the Roman Martyrology on 25 November. Her feast was removed from the General Roman Calendar in 1969 but restored in 2002 as an optional memorial. In the Episcopal Church, St. Catherine is commemorated on 24 November, together with the martyrs Barbara of Nicomedia and Margaret of Antioch, while in the Church of England her feast day is 25 November.

Titus Flavius Clemens, also known as Clement of Alexandria (Ancient Greek: Κλήμης ὁ Ἀλεξανδρεύς; c. 150 – c. 215 AD), was a schematic Christian theologian and philosopher who taught at the Catechetical School of Alexandria. Among his pupils were Origen and Alexander of Jerusalem. A convert to Christianity, he was an educated man who was familiar with classical Greek philosophy and literature. As his three major works demonstrate, Clement was influenced by Hellenistic philosophy to a greater extent than any other Christian thinker of his time, and in particular, by Plato and the Stoics. His secret works, which exist only in fragments, suggest that he was familiar with pre-Christian Jewish esotericism and Gnosticism as well. In one of his works he argued that Greek philosophy had its origin among non-Greeks, claiming that both Plato and Pythagoras were taught by Egyptian scholars.

Clement is usually regarded as a Church Father. He is venerated as a saint in Coptic Christianity, Eastern Catholicism, Ethiopian Christianity, and Anglicanism. He was revered in Western Catholicism until 1586, when his name was removed from the Roman Martyrology by Pope Sixtus V on the advice of Baronius. The Eastern Orthodox Church officially stopped any veneration of Clement of Alexandria in the 10th century. Nonetheless, he is still sometimes referred to as "Saint Clement of Alexandria" by both Eastern Orthodox and Catholic authors.

According to the Gospel of John, Mary of Clopas (Ancient Greek: Μαρία ἡ τοῦ Κλωπᾶ, María hē tou Clōpá) was one of the women present at the crucifixion of Jesus and bringing supplies for his funeral. The expression Mary of Clopas in the Greek text is ambiguous as to whether Mary was the daughter or wife of Clopas, but exegesis has commonly favoured the reading "wife of Clopas". Hegesippus identified Clopas as a brother of Joseph. In the latest official edition of the Roman Martyrology of the Catholic Church she is commemorated with Salome on April 24.

Along with Mary Magdalene and "Mary" Salome, Mary of Clopas is known as one of the Three Marys at the tomb of Jesus. Her relics are said to be in France at the Church of the Saintes Maries de la Mer.

Pope Leo II (c. 01 January 611 – 28 June 683) was the Bishop of Rome from 17 August 682 to his death on 28 June 683. One of the popes of the Byzantine Papacy, he is described by a contemporary biographer as both just and learned. He is commemorated as a saint in the Roman Martyrology.

Saint Erik (c. 1125 – 18 May 1160), also called Eric IX or Erik Jedvardsson was King of Sweden from c. 1156 until his death in 1160. The Roman Martyrology of the Catholic Church names him as a saint memorialized on 18 May. He was the founder of the House of Erik, which ruled Sweden with interruptions from c. 1156 to 1250.