This was followed in the summer by an engagement between Mary and John Montagu, heir to the Earl of, and later Duke of, Montagu, (they later married on 20 March 1705 (O.S.)).
Dette blev om sommeren fulgt af en forlovelse mellem Mary og John Montagu, arving efter jarlen, og senere hertug af Montagu, (de giftede sig senere, den 20. marts 1705).