George Cassander

[1] On his journeys, which were undertaken in the company, and at the expense of his friend, Cornelius Wouters, he visited Rome, and in 1544 came to Cologne, where he settled permanently in the summer of 1549.

[1] After a profound study of the points of difference between the Catholic and reformed churches, he devoted himself to the project of reunion, thus anticipating the efforts of Gottfried Leibniz.

[2] Jacques Auguste de Thou described Cassander as "...modest, void of arrogance; and he was as ardent in his wishes for a religious union, and made as many concessions for the accomplishment for this object, as could be expected from a person who continued in the Catholic communion.

[2] Cassander's activity in promoting religious peace between Catholics and Protestants began in 1561 with the publication of his anonymous book: De officio pii viri in hoc religionis dissidio.

While never attacking dogma, and even favoring the Roman church on the ground of authority, he criticizes the papal power and makes reflections on practices.