Gaining his freedom at the instance of Hungarian magnates, he visited Melanchthon at Wittenberg, and in 152 4 became professor of Greek at the university of Heidelberg, being in addition professor of Latin from 1526.
Agricola was apparently satisfied in conference with Luther and Melanchthon at Torgau, December 1527.
Luther received a fresh impulse towards the study of Greek, and his translation of the Scriptures, begun as early as 1517, now made rapid progress, Melanchthon helping to collate the Greek versions and revising Luther's translation.
Luther, Justus Jonas, Melanchthon and Johann Bugenhagen were appointed to draw up a statement of the Saxon position.
At Wittenberg the crypto-Calvinist controversy was then at its height, and he took the side of Melanchthon and the crypto-Calvinists.
We notice in him resolute Predestinarianism - as in Luther, and at first in Melanchthon too; the vehicle of revived Augustinian piety - and resolute depotentiation of sacraments, with their definite reduction to two (admittedly the two chief sacraments) - baptism and the Lord's Supper.
The proceedings opened on the 1st of October with conferences between Luther and Oecolampadius, and Melanchthon and Zwingli: then on the two following days the discussion proper - confined almost entirely to Luther and Zwingli - was held before the landgrave and his guest Duke Ulrich of Wurttemberg, in the presence of more than fifty persons.
After the first Diet of Spires (1526), where a precarious peace was patched up for the reformed faith, Melanchthon was deputed as one of twenty-eight commissioners to visit the reformed states and regulate the constitution of churches, he having just published a famous treatise called the Libellus visitatorius, a directory for the use of the commissioners.
The most learned of modern Melanchthon scholars was probably Karl Hartfelder, who wrote Philipp Melanchthon als Praeceptor Germaniae (Berlin, 18 99); Melanchthoniana paedagogica (Leipzig, 1892), giving in the first named two full bibliographies, one of all works written on Melanchthon, the other of all works written by him (in chronological order).
ZACHARIAS URSINUS (1534-1583), German theologian, and one of the authors of the Heidelberg Catechism, was born at Breslau on the 18th of July 1534, and became a disciple of Melanchthon at Wittenberg.