“Sotheby’s is selling more than 20,000 items from the royal House of Hanover at the Marienburg Castle near Hanover, in northern Germany. Divided into about 4,700 lots, many of royal provenance, the sale includes glass and porcelain, silver, arms and armor, old master paintings, uniforms and textiles belonging to the kings and princes of England and Hanover from the 15th through the 19th centuries.”