Saint John of the Cross  was a major figure of the Counter-Reformation, a Spanish mystic, a Roman Catholic saint, a Carmelite friar and a priest who was born at Fontiveros, Old Castile.
John of the Cross was a reformer in the Carmelite Order of his time and the movement he helped initiate, along with Saint Teresa of Ávila, eventually led to the establishment of the Discalced Carmelites, though neither he nor Teresa were alive when the two orders separated. He is also known for his writings. Both his poetry and his studies on the growth of the soul are considered the summit of mystical Spanish literature and one of the peaks of all Spanish literature. He was canonized as a saint in 1726 by Pope Benedict XIII. He is one of the thirty-six Doctors of the Church.