Marie biscuits are plain biscuits, well suited to dunking in a cup of tea. But why are they called Marie? They are named after the Grand Duchess Maria Alexandrovna, the daughter of Tsar Alexander II of Russia, who in 1874 married the second son of Queen Victoria, Alfred, the Duke of Edinburgh and later Duke of Saxe-Coburg and Gotha. The bakery Peek Freans created the biscuit in honour of the marriage. Maria Alexandrovna was the only member of the Romanov dynasty to marry into the British royal family and her arrival in Britain captured the public's imagination. Tennyson was the poet laureate at the time and he composed a poem in the grand duchess's honour (read it here).