St. John the Great Sinner was born into a Christian family in March 1546 in Spain. When he was 19 he left his business and gave away his belongings to live as a hermit. He worked in prisons and hospitals in Jerez de la Frontera, and he later founded the Hospital of Our Lady of Candlemas in Jerez. He joined the Order of Hospitallers in 1574. In 1600 he died while caring for those who were dying of the plague. St. John the Great Sinner is patron saint of the diocese of Jerez de la Frontera.