Sandwich Day

Yes, it's true. There is in fact such a thing as "Sandwich Day", another one of the food holidays, and it is today. The day is the anniversary of the birth of John Montagu, 4th Earl of Sandwich who is credited with inventing everyone's favorite two-slices-of-bread-with-something-inside snack. Does this mean Mr. Montagu is indirectly the inventor of Oreo cookies as well?