Gustave Vaëz (1812 – 1862) Jean-Nicolas-Gustave Van Nieuwen-Huysen (known as Gustave Vaëz) was a Belgian playwright, librettist and translator of opera librettos. Born in Brussels, he studied law and earned a doctorate at the State University of Leuven. Since he had no desire to work as a lawyer, he devoted himself to a career as a playwright. Wikipedia