Calixtus, George, a Lutheran theologian of an eminently tolerant type, born at Sleswick; travelled for four years in Germany, Belgium, England, and France; accused of heresy, or rather apostasy, for the liberal spirit in which he had learned in consequence to treat both Catholics and Calvinists, and for considering the Apostles' Creed a broad enough basis for Christian union and communion, which might embrace both; his friends, however, stood by him, and he retained the position he held in the Lutheran Church (1586-1656).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Calixtus * Calla`o