Catherine of Siena (25 March 1347 – 29 April 1380), a laywoman associated with the Dominican Order, was a mystic, activist, and author who had a great influence on Italian literature and the Catholic Church. Canonized in 1461, she is also a Doctor of the Church.
She was born and raised in Siena, and at an early age wanted to devote herself to God, against the will of her parents. She joined the Dominican tertiaries. She made herself known very quickly by being marked by mystical phenomena such as invisible stigmata and a mystical marriage. Her influence with Pope Gregory XI played a role in his decision to leave Avignon for Rome. She was then sent by him to negotiate peace with Florence. After Gregory XI's death and peace concluded, she returned to Siena. She dictated to secretaries her set of spiritual treatises The Dialogue of Divine Providence. The Great Schism of the West led Catherine of Siena to go to Rome with the pope. She sent numerous letters to princes and cardinals to promote obedience to Pope Urban VI and defend what she calls the "vessel of the Church." She died on 29 April 1380, exhausted by her penances. Urban VI celebrated her funeral and burial in the Basilica of Santa Maria sopra Minerva in Rome.
The devotion around Catherine of Siena developed rapidly after her death. She was canonized in 1461, declared patron saint of Rome in 1866, and of Italy (together with Francis of Assisi) in 1939.
She was the first woman (along with Teresa of Ávila) to be declared a "doctor of the Church," on 4 October 1970 by Pope Paul VI. She was also proclaimed patron saint of Europe in 1999 by Pope John Paul II. Catherine of Siena is one of the outstanding figures of medieval Catholicism, by the strong influence she has had in the history of the papacy and her extensive authorship. She was behind the return of the Pope from Avignon to Rome, and then carried out many missions entrusted by the pope, something quite rare for a woman in the Middle Ages. Her Dialogue, hundreds of letters, and dozens of prayers, also give her a prominent place in the history of Italian literature.

Edmund Garratt Gardner FBA (12 May 1869 – 27 July 1935) was an English scholar and writer, specializing in Italian history and literature. At the beginning of the twentieth century, he was regarded as one of the foremost British Dante scholars.