This article looks at the history of the Catechism as commissioned by Frederick III and undertaken by Ursinus and Olevianus. The purpose of the writing of the Heidelberg Catechism was for the instruction of the youth.

This is the introduction Zacharias Ursinus wrote to his commentary on the Heidelberg Catechism in the 16th century. It looks at the practice and importance of teaching from the Heidelberg Catechism.

This article is about the life and legacy of Zacharias Ursinus (1534-1583).

This is an account of the history of the Heidelberg Catechism, and the role of Frederick II, Frederick III, Otto Henry, Casper Olevianus, and Zacharias Ursinus in its creation.