In 1830, the Protestant parish, numbering just some 1200 members at that time, purchased St. John’s Church. 100 years later, nearly one third of the population of Mainz, over 30,000, were Protestant. The expansion of the city by the New City at the end of the 19th century came just at the right moment in the search for a new main church. With the Kaiserstrasse, a splendid boulevard was constructed, in the middle of which the church designed by the City Architect Eduard Kreyssig, unavoidably attracts attention, even today.