This creation was for life only , and so the title expired on her death in 1725 .
Baroness von Kielmansegg , half - sister of King George I , was made countess of Darlington in 1722 .
This creation was for life only , and so the title expired on von Kielmansegg 's death in 1725 .
Baroness von Kielmansegg , half - sister of King George I , was made countess of Darlington in 1722 .