René Descartes discussed the problem briefly in 1643, in a letter to Princess Elisabeth of the Palatinate.
In 1677, William Penn himself arrived together with Robert Barclay, and remained three days, holding meetings which made a deep impression upon the countess.
In 1643 Descartes began a prolific written correspondence with Princess Elisabeth of Bohemia, in which he answered her moral questions, especially the nature of happiness, passions, and ethics.
Rhineland-Palatinate | Elisabeth | Palatinate | Elisabeth Schwarzkopf | Upper Palatinate | Elisabeth Shue | Palatinate (region) | Elisabeth Frink | Queen Elisabeth Music Competition | Elisabeth (musical) | Boxberg, Rhineland-Palatinate | Elisabeth of Wied | Elisabeth of Bavaria | Schaumburg Castle, Rhineland-Palatinate | Palatinate Forest | Mettenheim, Rhineland-Palatinate | Kerpen, Rhineland-Palatinate | Empress Elisabeth of Austria | Elisabeth Sladen | Elisabeth Olin | Elisabeth of Bavaria, Electress of Saxony | Elisabeth Moss | Palatinate-Zweibrücken-Birkenfeld | Elisabeth Rethberg | Elisabeth Grümmer | Countess Elisabeth Dobržensky de Dobrženicz | Wagenhausen, Rhineland-Palatinate | Schönberg, Rhineland-Palatinate | Palatinate-Zweibrücken | Maria of the Palatinate-Simmern |