Jelaskan terakhir mereka." dari Custanza dari Sisilia (1154-1198)

—Paradiso, Canto III, lines 109-120, terjemahan Mandelbaum

Custanza telah mengatur pernikahan antara putranya dan seorang putri Aragon, yang akan terjadi pada tahun 1209.

Costanza, sacred opera performance at Our Lady of Mt. Carmel Church, Bronx, NY on 26 October 2008. John Marino, distinguished composer conductor, arranger, pianist, coordinated the performance. The libretto was written by Florence Bocarius.

Mary Taylor Simeti, Travels with a Medieval Queen, 2001. .