Clare of Assisi
St. Clare was born in 1196, and was already a faithful Christian when she heard St. Francis of Assisi preaching in 1211. Escaping an arranged marriage, she heeded the advice of Francis to devote her life to God, and she organized a group of women called the Poor Ladies of San Damiano. Under her leadership the group survived on charitable donations from locals, rather than begging for alms as the monks did. Following the rules that Clare herself set down, the Poor Ladies of San Damiano went barefoot, never ate meat, and wore rough habits.
Clare's theology was centered on her concept of Christ-the-Mirror: that one must hold up Christ as a mirror to one's own faith, and strive to live as he did and be as he was. Due to Clare's popularity, convents of her followers appeared all throughout Europe. Clare herself, though, remained abbess at San Damiano until her death in 1253.
"Simone Martini 047" by Simone Martini - The Yorck Project: 10.000 Meisterwerke der Malerei. DVD-ROM, 2002. ISBN 3936122202. Distributed by DIRECTMEDIA Publishing GmbH. Licensed under Public Domain via Wikimedia Commons - https://commons.wikimedia.org/wiki/File:Simone_Martini_047.jpg#/media/File:Simone_Martini_047.jpg
Read some of Clare's writings in The Riches of Simplicity: Selected Writings of Francis and Clare.