John, Count of Nassau-Idstein
His parents were Louis II, Count of Nassau-Weilburg (1565–1627) and his wife, Landgräfin Anna Maria of Hesse-Kassel (1567–1626).His father had in 1605 reunited all the possessions of the Walram line of the House of Nassau: Saarbrücken, Weilburg and Idstein.On 7 July 1629, the Reichskammergericht ruled that the House of Nassau had to return city and castle of Sarrewerden, Bouquenom and Wieberstweiler to the Bishopric of Metz as fiefs of Lorraine.[1] When, at the end of that year, King Gustavus Adolphus of Sweden appeared the Rhine, presented William Louis, John and Ernest Casimir joined him in his war against the Emperor.After King Gustavus Adolphus had fallen on 16 November 1632, the three counts committed themselves on a meeting of Protestant princes in Heilbronn to continue fighting the Emperor, now under the Swedish Chancellor Axel Oxenstierna.After Sweden and its allies were defeated, Emperor Ferdinand II terminated the fief of the Nassau territories.In 1630, witch trials began in his territory and John ordered pastors to preach against the havoc brought about by witchcraft.