Paul Speratus
Paul Speratus was a Catholic priest who became a Protestant preacher and hymnwriter. In 1523, he helped Martin Luther to create the First Lutheran hymnal, published in 1524 and called Achtliederbuch.
Paul Speratus was born in Rtlen in Swabia, on or aboutDecember 1484, probably to a wealthy family. His original surname, Latinized to Speratus, may have been Spreter, Hoffer, or Offer. In later years would write his name as von Rtlen or von Ellwangen, Priester der Dicese Augsburg .
Source: Wikipedia