 His followers were instantly labeled "Zwinglians", consistent with the Catholic practice of naming heresy after its founder.Very soon, Zwingli was joined by Martin Bucer, Wolfgang Capito, William Farel, Johannes Oecolampadius and other early Reformed thinkers.The namesake of the movement, French reformer John Calvin, renounced Roman Catholicism and embraced Protestant views in the late 1520s or early 1530s, as the earliest notions of later Reformed tradition were already espoused by Huldrych Zwingli.