Catherine married William Pole-Tylney-Long-Wellesley, 4th Earl of Mornington on 14 Mar 1812. William (son of William Wellesley-Pole, 3rd Earl of Mornington and Katherine Elizabeth Forbes) was born on 22 May 1788; died on 1 Jul 1857 in Thayer St., Marylebone, Middlesex, England. [Group Sheet] [Family Chart]