Who married Mary Stuart?

Thomas Knox, 2nd Earl of Ranfurly married Mary Stuart on February 28, 1815. Mary Stuart was 17 years old on the wedding day (17 years, 10 months and 25 days). Thomas Knox, 2nd Earl of Ranfurly was 28 years old on the wedding day (28 years, 10 months and 9 days). The age gap was 10 years, 11 months and 15 days.

The marriage ended in ?.