Clare's community became known as the Poor Ladies of San Damiano, later the Poor Clares, and its defining struggle was over one point: whether the sisters could hold property at all, even in common, or had to depend entirely on begging and gifts as the friars did. Successive popes, worried that a community of enclosed women could not reliably support itself by alms the way traveling friars could, pressed Clare to accept an endowment or at least a modified rule permitting corporate ownership.
Clare refused for decades, securing from Pope Innocent III, reportedly by personal petition, a Privilegium Paupertatis, a formal privilege guaranteeing San Damiano the right to own nothing, and spent the rest of her life defending it against later pressure to soften it. She wrote her own rule for the order, the first monastic rule known to have been composed by a woman, and secured its papal approval from Innocent IV only two days before she died in 1253, the goal of a campaign that had occupied most of her adult life.
During the siege of Assisi by imperial troops in 1240, tradition holds that Clare, too ill to stand, had herself carried to the convent wall with the Blessed Sacrament exposed in a monstrance, and that the attacking soldiers withdrew, an episode behind her later designation as patron of television for what medieval writers already read as a kind of vision carried across distance. She was canonized in 1255, two years after her death, by Pope Alexander IV.