Claim: A Marie biscuit, also known as María, Mariebon, Мария and Marietta, is a type of round vanilla-flavored biscuit similar to a rich tea biscuit  created by the London bakery Peek Freans in 1874 which are frequently served to children.
Evidence: A Marie biscuit is a type of biscuit similar to a rich tea biscuit. It is also known as María, Mariebon, Мария and Marietta, amongst other names. The Marie biscuit was created by the London bakery Peek Freans in 1874 to commemorate the marriage of the Grand Duchess Maria Alexandrovna of Russia to the Duke of Edinburgh. Marie biscuits are frequently served to children, and to infants who may be served the biscuits softened in milk as their first 'solid' food. It is made with wheat flour, sugar, palm oil or sunflower seed oil and, unlike the rich tea biscuit, is typically vanilla-flavoured. The biscuit is round and usually has the name embossed upon its top surface, the edges of which are also embossed with an intricate design.