Pero Tafur, Andancas é viajes de Pero Tafur por diversas partes del mundo avidos (1435-1439), Madrid 1874 (Coleccion de Libros Espagnoles raros é curiosos VIII). Chapter XXIII.
"I departed from that lord, and lower down the Rhine, on the right hand, I came to a town called Nymegen, that is to say, New May. It was founded by Julius Caesar, and there is a stone there with the whole story inscribed on it. This town belongs to the Duke of Guelders, who is a great lord and even richer than the one I had just left. He is married to a daughter of the Duke of Burgundy. This town is in every way the most beautiful that I have seen. It is very strong, being built on the rocks behind a strong wall and moat. I was there three days and saw the Duke, who was a league out of the town in a palace which he has in the country for riding and hunting. He received me very kindly, and I saw there the Duchess and their sons and daughters, and they desired me to dine with them, and in the evening I took my leave and returned to the town. The next day I departed and arrived at a large town called Bois-le-duc, which is in Brabant and belongs to the Duke of Burgundy. It is a very remarkable place, although not well populated. The river runs into the town in many places, and they breed as many swans as there are geese in Castile. They say that the Duke of Burgundy orders them to be distributed among the people, who bring up the birds and have to render an account of them, and on feast days they are eaten and esteemed to be a great luxury. I purchased a horse here for sixteen ducats which would, without doubt, have fetched a hundred at home."