Margrave Christian took his residence in Bayreuth; in 1655 he was succeeded by his grandson Christian Ernst, who gained power and influence on Imperial politics in the military rank of a Field marshal. In 1705 his son Prince George William founded the "Ordre de la Sincerité", predecessor to the Prussian Order of the Red Eagle. Margrave Frederick, ruling from 1735, and his wife Wilhelmine of Prussia, both patrons of arts and sciences, had the Bayreuth residence largely rebuilt in a distinct Baroque style ("Markgrafenstil"), including the erection of the Margravial Opera House finished in 1748. A university was founded in 1742 and relocated to Erlangen the next year.