Heinrich Bullinger was a Swiss Reformer and theologian, the successor of Huldrych Zwingli as head of the Church of Zürich and a pastor at the Grossmünster. One of the most important leaders of the Swiss Reformation, Bullinger co-authored the Helvetic Confessions and collaborated with John Calvin to work out a Reformed doctrine of the Lord's Supper.

The Grossmünster is a Romanesque-style Protestant church in Zürich, Switzerland. It is one of the four major churches in the city. Its congregation forms part of the Evangelical Reformed Church of the Canton of Zürich. The core of the present building near the banks of the Limmat was constructed on the site of a Carolingian church, which was, according to legend, originally commissioned by Charlemagne. Construction of the present structure commenced around 1100 and it was inaugurated around 1220.