Franz Liszt's amorous exploits provided ample material for gossips. He began a ten year relationship with Marie d'Agoult who left her husband in 1835 to elope with him to Switzerland. He subsequently had several affairs, most notably with the Polish Princess Carolyne Sayn-Wittgenstein, the courtesan Marie Duplessis, and the dancer Lola Montes. Naturally, Liszt (whose daughter Cosima was illegitimate) was rumored to have fathered several children, including the pianist Franz Servais. He denied it. "I know his mother only by correspondence," he declared, "and one cannot arrange that sort of thing by correspondence."