With the establishment of Christian monasticism, other influential roles became available to women. From the 5th century onward, Christian convents provided opportunities for some women to escape the path of marriage and child-rearing, acquire literacy and learning, and play a more active religious role. In the later Middle Ages women such as Saint Catherine of Siena and Saint Teresa of Avila, played roles in the development of theological ideas and discussion within the church, and were later declared Doctors of the Roman Catholic Church. The Belgian nun, St Juliana of Liège (1193-1252), proposed the Feast of Corpus Christi, celebrating the body of Christ in the Eucharist, which became a major feast throughout the Church. In the Franciscan movement of the thirteenth century, religious women like St. Clare of Assisi played a significant part. Later, Joan of Arc took up a sword and achieved military victories for France, before being captured and tried as a "witch and heretic", after which she was burned at the stake. A papal inquiry later declared the trial illegal. A hero to the French, sympathy grew for Joan even in England. Pope Benedict XV canonized Joan in 1920.