Complex sentence: Torquato Tasso's 1581 epic poem "La Gerusalemme liberata" and Voltaire's 1732 play, "Zaïre" were the sources for the majority of operas in this list and are described in more detail below.
Split into simpler sentences: Torquato Tasso's 1581 epic poem "La Gerusalemme liberata" (Jerusalem Delivered); and Voltaire's 1732 play, "Zaïre". These latter two account for the majority of operas in this list and are described in more detail below.