Images of Black People in European Heraldry

This is a really interesting article.

Modern specialists in the science of heraldry suspect, however, that this blazon (coat of arms) of the blackamoor is instead the very opposite of a negative symbol. In the last decade or two it has been pointed out that the moor’s head quite possibly could have referred to St. Maurice, the black patron saint of the Holy Roman Empire from the beginning of the 10th century.
Because of his name and native land, St. Maurice had been portrayed as black ever since the 12th century. The insignia of the black head, in a great many instances, was probably meant to represent this soldier saint since a majority of the arms awarded were knightly or military. With 6,666 of his African compatriots, St. Maurice had chosen martyrdom rather than deny his allegiance to his Lord and Saviour, thereby creating for the Christian world an image of the Church Militant that was as impressive numerically as it was colourwise.
Here, no doubt, is a major reason why St. Maurice would become the champion of the old Roman church and an opposition symbol to the growing influence of Luther and Calvin. The fact that he was of the same race as the Ethiopian baptized by St. Philip in Acts of the Apostles was undoubtedly an important element to his significance as well. Since this figure from the New Testament was read as a personification of the Gentile world in its entirety, the complexion of St. Maurice and his Theban Legion (the number of which signified an infinite contingent) was also understood as a representation of the Church’s universality – a dogmatic ideal no longer tolerated by the Reformation’s nationalism. Furthermore, it cannot be coincidental that the most powerful of the German princes to remain within the Catholic fold, the archbishop Albrecht von Brandenburg, not only dedicated practically all the major institutions under his jurisdiction to St. Maurice but in what is today one of the most important paintings of the Renaissance, had himself portrayed in Sacred Conversation with him….
…it is likely that St. Maurice and his Theban Legion became associated with Prester John as the ideal soldiers for the ideal state. It should be pointed out, furthermore, that, heraldically, since he was the only monarch who could claim the ‘Sang Real’ or the ‘Royal Blood’ of Christ because of his descent from Solomon, Prester John was the only individual deemed worthy of the right to bear as arms the image of the Crucifix. Even the earring traditionally worn by the blackamoor is a reference to this sacred privilege.

I believe a little of this came up after the election of Pope Benedict XVI.