#Onthisday in history Heinrich Bullinger was born 18th July 1504 A.D. – 17th September 1575 A.D. he was a Swiss reformer and the successor of Huldrych Zwingli who was the head of the Zurich church and a pastor of Grossmunster. Heinrich was a much less controversial figure than Martin Luther or John Calvin, but nevertheless he was important and was long underestimated. Research shows that he was one of the most important and influential theologians of the Protestant Reformation in the 16th century.