Earl Londonderry is in Earl Ireland.
In 1641 Weston Ridgeway 3rd Earl Londonderry succeeded 3rd Earl Londonderry.
In 1670 Weston Ridgeway 3rd Earl Londonderry died. His son Robert [aged 19] succeeded 4th Earl Londonderry.
In 1686 Robert Ridgeway 4th Earl Londonderry [aged 35] and Lucy Jobson Countess Londonderry were married. She by marriage Countess Londonderry. He the son of Weston Ridgeway 3rd Earl Londonderry and Frances Temple.
On 7th March 1714 Robert Ridgeway 4th Earl Londonderry [aged 63] died. Earl Londonderry extinct.