At the age of 20 Clarice set her heart upon marriage with the Marchese Capizucchi, but was passed over by him in favor of her younger sister, Ortensia. Disappointed, she entered the monastery in Viterbo where she had been educated, receiving the name Hyacintha. She admitted later that she did this only to hide her chagrin and not to give up the luxuries of the world. She kept a private stock of extra food, wore a habit of the finest material and received and paid visits at will.