George Leo Haydock (1774–1849), scion of an ancient English Catholic Recusant family, was a priest, pastor and Bible scholar. His edition of the Douay Bible with extended commentary, originally published in 1811, became the most popular English Catholic Bible of the 19th century on both sides of the Atlantic. It remains in print and is still regarded for its apologetic value.
His eventful early years included a narrow scrape with the French Revolution and a struggle to complete his priestly studies in the years before Catholic Emancipation. He would go on to serve poor Catholic missions in rural England.
George Leo Haydock was born on 11 April 1774 in Cottam, Preston, Lancashire, the heart of Catholic resistance to the Penal Laws that the English government used to enforce Anglicanism. His parents were George Haydock and his second wife, Anne (née Cottam), who produced a generation that would become outstanding in Catholic service. Their eldest son, James Haydock (1765–1809), became a priest who died caring for the sick of his congregation during an epidemic; the next, Thomas Haydock (1772–1859), became a prominent publisher of Catholic books. Among three daughters, Margaret (1767? - 1854), joined the Augustinian nuns, taking the name Sister Stanislaus. George was the youngest son. He and his father were namesakes of an illustrious ancestor, Blessed George Haydock (1556–1584), a martyred "seminary priest" during the Elizabethan persecution, beatified in 1987. While attending a school established for Catholic students at Mowbreck Hall, Wesham, George received Confirmation, taking the name Leo, after the fifth-century saint, Pope Leo I, whose liturgical feast was at that time celebrated on Haydock's birthday (see General Roman Calendar as in 1954). In 1785, at eleven years of age, he was sent to further his education at the English College, Douai, (English spelling, Douay or Doway ) France, established in the 16th century for Catholic exiles, where provision was made for secondary education.