Prince Albert of Prussia was a Prussian general field marshal, Herrenmeister of the Order of Saint John from 1883 until his death, and regent of the Duchy of Brunswick from 1885, also until his death.

The Bailiwick of Brandenburg of the Chivalric Order of Saint John of the Hospital at Jerusalem, commonly known as the Order of Saint John or the Johanniter Order, is the German Protestant branch of the Knights Hospitaller, the oldest surviving chivalric order, which generally is considered to have been founded at Jerusalem in 1099.