Giacomo Casanova,
The Memoirs of Jacques Casanova de Seingalt…
“ The stupefied astonishment of Leonilda and the duke cannot be described. They could see that Donna Lucrezia and I knew each other, but they could not get any farther. As for myself, as I pondered gloomily and compared Leonilda’s age with the period at which I had been intimate with Lucrezia Castelli, I could see that it was quite possible that she might be my daughter; but I told myself that the mother could not be certain of the fact, as at the time she lived with her husband, who was very fond of her and not fifty years of age. ”
