This holy virgin was a native of Monte Pulciano, in Tuscany. She had scarce attained to the use of reason, when she conceived an extraordinary relish and ardor for prayer, and in her infancy often spent whole hours in reciting the Our Father and Hail Mary, on her knees, in some private corner of a chamber.
At nine years of age she was placed by her parents in a convent of Sackins, of the order of St. Francis, so called from their habit, or at least their scapular, being made of sackcloth. Agnes, in so tender an age, was a model of all virtues to this austere community: and she renounced the world, though of a plentiful fortune, being sensible of its dangers before she knew what it was to enjoy it.
At fifteen years of age she was removed to a new foundation of the order of St. Dominic, at Proceno, in the county of Orvieto, and appointed abbess by pope Nicholas IV. She slept on the ground, with a stone under her head in lieu of a pillow; and for fifteen years she fasted always on bread and water, till she was obliged by her directors, on account of sickness, to mitigate her austerities.
Her townsmen, earnestly desiring to be possessed of her again, demolished a lewd house, and erected upon the spot a nunnery, which they bestowed on her. This prevailed on her to return, and she established in this house nuns of the order of St. Dominic, which rule she herself professed. The gifts of miracles and prophecy rendered her famous among men, though humility, charity, and patience under her long sicknesses, were the graces which recommended her to God.
She died at Monte Pulciano, on the 20th of April, 1317, being forty-three years old. Her body was removed to the Dominicans” church of Orvieto, in 1435, where it remains. Clement VIII approved her of office for the use of the order of St. Dominic, and inserted her name in the Roman Martyrology. She was solemnly canonized by Benedict XIII. in 1724.
(Source: Butler’s Lives of the Saints)