Saint Catherine of Siena was born on March 25, 1347, Siena, Tuscany.
Catherine became a tertiary of the Dominican order in 1363, joining the sisters of Penitence of St Dominic in Siena.
In 1376, Catherine determined to take public action for peace within the church and Italy and to encourage a crusade against Muslims.
Catherine left for Tuscany in 1376 after Pope Gregory set out from Rome.
At his request she went to Florence in 1378. After a short final stay in Siena, she completed the dialogue she begun the previous year and then went to Rome in November by an invitation from the pope.
While she was in Rome, she helped organize 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.
Catherines writings include about 380 letters, 26 prayers and the 4 treatises, of Il libro della divina dottrino, better known as the dialogue. The dialogue illustrates her doctrine of the inner cell of the knowledge of god and of self into which she withdrew. Her works were published in 17107- 21.