The Sacred Military Constantinian Order of Saint George, also historically referred to as the Imperial Constantinian Order of Saint George and the Order of the Constantinian Angelic Knights of Saint George, is a dynastic order of knighthood of the House of Bourbon-Two Sicilies. Currently, the grand magistry of the order is disputed among the two claimants to the headship of the formerly reigning House of Bourbon-Two Sicilies as heirs of the House of Farnese, namely Prince Pedro and Prince Carlo. The order was one of the rare orders confirmed as a religious-military order in the papal bull Militantis Ecclesiae in 1718, owing to a notable success in liberating Christians in the Peloponnese. Together with the Sovereign Military Order of Malta, it is one of a small number of Catholic orders that still have this status today. It is not an order of chivalry under the patronage of the Holy See, but its membership is restricted to practising Catholics.

Gerhard Ludwig Müller is a German cardinal of the Catholic Church. He served as the Cardinal-Prefect of the Congregation for the Doctrine of the Faith (CDF) from his appointment by Pope Benedict XVI in 2012 until 2017. Pope Francis elevated him to the rank of cardinal in 2014.