In the 18th century, Americans composed a number of their own hymns, often based on the Old Testament; the English nonconformist Isaac Watts, especially his "Hymns and Spiritual Songs", was also very popular. John Wesley, the founder of the Methodist Church, played a major role in revivalist hymnody after a trip to Georgia in 1735 at the invitation of James Oglethorpe. Wesley and his brother, Charles Wesley, went with Oglethorpe and twenty-six Moravian missionaries. The Moravian singing inspired John Wesley to study their music. He published a collection of translations of German hymns in 1737, "A Collection of Psalms and Hymns", then returned to England in 1738, attending meetings of the Moravian Brethren in London. There, during a reading of Luther's preface to the Epistle to the Romans, Wesley had a spiritual experience and found his faith in Christ rejuvenated.