Anton Günther, Duke of Oldenburg, grandson of the last reigning Grand Duke of Oldenburg, died on Saturday at 91. He is succeeded as head of the house by his son Christian (b 1955). (Spurred by the Duke's passing I have reorganized my page on German Ruling Families according to the organization of the German Empire.)
Not quite royalty, but almost: Deborah, Dowager Duchess of Devonshire, last of the famous Mitford sisters, died this morning at 94.
May both titled nonagenarians rest in peace.