The extant works of Conrad Grebel consist of 69 letters written by him from September 1517 to July 1525, three poems, a petition to the Zürich council, and portions of a pamphlet written by him against infant baptism, as quoted by Zwingli in his counterarguments. Three letters written to Grebel (Benedikt Burgauer, 1523; Vadian, 1524; and Erhard Hegenwalt, 1525) have been preserved. The majority of the 69 letters written by Grebel are from his student years, however, and shed little light on his ministry as an Anabaptist.