The Long (later Tylney-Long) baronetcy, of Westminster, was a title in the Baronetage of England.
[1] Long never married and, lacking male descendants, was succeeded by his nephew James, the second Baronet.
Sir James Long, the 5th Baronet, represented several constituencies in the House of Commons.
His only son, also James, the eighth Baronet, died young in 1805 and the baronetcy became extinct.
She married William Wellesley-Pole, later the 4th Earl of Mornington, who assumed the additional surnames of Tylney and Long.