Another thing that greatly troubled the Lutherans was, that in 1614 John Sigismund, elector of Brandenburg, entered the communion of the Calvinists, and granted to all his sub jects entire liberty in religious matters, and left to the free choice of all whether they would embrace one religion or another, or any at all. But the Lutherans "deemed it intolerable that the Calvinists should enjoy the same privileges as them selves." And this was carried to such a length that the people of Brandenburg were prohibited from studying at the univer sity of Wittemberg.