I. Composition – II. Theology – III. Impact and Significance
I. Composition
Documentary testimony to the composition of the Heidelberg Catechism has not been preserved. In the foreword to the Opera Theologica of Z. Ursinus (vols. I–III, 1612), Quirinus Reuter reports that Ursinus composed two catechisms at the behest of Elector Frederick II of the Palatinate: Unam quidem maiorem, pro studiosis adultioribus, et scholis maioribus, alteram minorem, captui populi et puerili…