He was second Son of Kurfurst Joachim Friedrich, who had meant him for the Church.
[1577-1624: Rentsch, p.

486.] The young fellow was Coadjutor of Strasburg, almost from the time of getting into short-clothes.

He was then, still very young, elected Bishop there (1592); Bishop of Strasburg,--but only by the Protestant part of the Canons; the Catholic part, unable to submit longer, and thinking it a good time for revolt against a Protestant population and obstinately heterodox majority, elected another Bishop,--one "Karl of the House of Lorraine;" and there came to be dispute, and came even to be fighting needed.

Fighting; which prudent Papa would not enter into, except faintly at second-hand, through the Anspach Cousins, or others that were in the humor.
Troublesome times for the young man; which lasted a dozen years or more.

At last a Bargain was made (1604); Protestant and Catholic Canons splitting the difference in some way; and the House of Lorraine paying Johann George a great deal of money to go home again.
[_OEuvres completes de Voltaire,_ 97 vols.