Baron Mornington is in Baron Ireland.
On 9th July 1746 Richard Colley aka Wesley 1st Baron Mornington [aged 56] was created 1st Baron Mornington.
On 6th February 1759 Garrett Wellesley 1st Earl Mornington [aged 23] and Anne Hill Countess Mornington [aged 16] were married. She by marriage Baroness Mornington.
On 31st January 1768 Richard Colley aka Wesley 1st Baron Mornington [aged 78] died. His son Garrett [aged 32] succeeded 2nd Baron Mornington.