Who was the father of the person "Principles of Philosophy" was dedicated to?
Principles of Philosophy:  In essence it is a synthesis of the "Discourse on Method" and "Meditations on First Philosophy" It was written in Latin, published in 1644 and dedicated to Elisabeth of Bohemia, with whom Descartes had a long-standing friendship. Elisabeth of the Palatinate: Elisabeth of the Palatinate (26 December 1618 – 11 February 1680), also known as Elisabeth of Bohemia, Princess Elisabeth of the Palatinate, or Princess-Abbess of Herford Abbey, was the eldest daughter of Frederick V, Elector Palatine (who was briefly King of Bohemia), and Elizabeth Stuart.
Frederick V, Elector Palatine