The coat of arms of the Order of St. Willibrord was taken from the arms of St. Willibrord, which inspired the coat of arms of the former episcopal Principality of Utrecht; and even continues now, as part of the current arms of the Province of Utrecht within the Kingdom of the Netherlands.
The prominent Chi Rho cross is an ancient symbol of Christianity, which first appeared to the Roman Emperor Constantine, the Great. It is also the symbol of the Old Catholic Confederation, which employs this ancient cross as its logo, indicating that the Order is Old-Catholic.
The coat of arms of the Priory of St. Willibrord is taken from the coat of arms of the Order of St. Willibrord (dexter) impaled with the hereditary coat of arms of the de Paulo family (sinister), since the priory was founded by Archbishop Dr. Craig J. N. de Paulo.
The de Paulo arms derive from a 12th century Italo-Norman ancestor, recognized by the former Kingdom of Naples, the former Kingdom of the Two Sicilies and now by the Kingdom of Spain.
The central charge of the de Paulo coat of arms is the crowned double-headed eagle, which either reflects the family's ancient connection with Charlemagne, the Holy Roman Empire or perhaps the Byzantine heritage of Southern Italy, known in antiquity as "Magna Graecia" The shield also has an open book with the letters "IHS," which in Greek, indicates Jesus and the armiger's Christian faith, along with two golden keys. The de Paulo arms were granted the "capo d'angio" in the Twentieth century by the Herald of the Kingdom of Spain, reflecting the family's connection with the Royal House of Bourbon of the Two Sicilies.
The Coat of Arms of St. Willibrord Priory
The artwork of the Order's heraldry was produced by H.E. Ljubodrag Gujic, Herald for the Royal House of Karadjordjevic of Serbia and Yugoslavia.