Catherine became a tertiary (a member of a monastic third order who takes simple vows and may remain outside a convent or monastery) of the Dominican order (1363), joining the Sisters of Penitence of St. Dominic in Siena. She rapidly gained a wide reputation for her holiness and her severe asceticism. When the rebellious city of Florence was placed under an interdict by Pope Gregory XI(1376), Catherine determined to take public action for peace within the church and Italy and to encourage a Crusade against the Muslims. She went as an unofficial mediator to Avignon with her confessor and biographer Raymond of Capua. Her mission failed, and she was virtually ignored by the pope, but while at Avignon she promoted her plans for a Crusade.
It became clear to her that the return of Pope Gregory XI to Rome from Avignon—an idea that she did not initiate and had not strongly encouraged—was the only way to bring peace to Italy. Catherine left for Tuscany the day after Gregory set out for Rome (1376). At his request she went to Florence (1378) and was there during the Ciompi Revolt in June. After a short final stay in Siena, during which she completed The Dialogue (begun the previous year), she went to Rome in November, probably at the invitation of Pope Urban VI, whom she helped in reorganizing the church. From Rome she sent out letters and exhortations to gain support for Urban; as one of her last efforts, she tried to win back Queen Joan I of Naples to obedience to Urban, who had excommunicated the queen for supporting the antipope Clement VII.
Catherine’s writings, all of which were dictated, include about 380 letters, 26 prayers, and the 4 treatises of Il libro della divina dottrina, better known as the The Dialogue, (c. 1475; Eng. trans. by Suzanne Noffke, 1980). The record of her ecstatic experiences in The Dialogue illustrates her doctrine of the “inner cell” of the knowledge of God and of self into which she withdrew. A complete edition of Catherine’s works, together with her biography by Raymond, was published in Siena (1707–21).
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The city was a land route from Europe to Asia and a waterway between the Mediterranean and the Black Sea. The strategic geographic location of Byzantium protected it from attacks.
