The first generation of the great Protestant Reformers laid a sturdy foundation upon the Five Solas and helped the Church pull away from the theological abuses of the Roman Catholics. When men like Martin Luther and Ulrich Zwingli died in the first half of the 16th century, they were followed by the second-generation of Reformers who carried on their work.
With the exception of John Calvin, Heinrich Bullinger may have been the most instrumental of the succeeding generation which sought to exalt Jesus Christ through the faithful preaching of His Word.