FORE:Though Frederick, in his private correspondence, often spoke very contemptuously of Voltaire, it would seem, if any reliance can be placed on the testimony of Voltaire himself, that Frederick sedulously courted the author, whose pen was then so potential in Europe. By express invitation, Voltaire spent a week with Frederick at Aix la Chapelle early in September, 1742. He writes to a friend from Brussels under date of December 10: