Daily entries from the 17th century London diary
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This is, according to Warrington: Lady Penelope O’Brien, daughter of Barnabas O’Brien, sixth Earl of Thomond, wife of the Earl of Peterborough.
Tangier connection;
had two daughters ,
[. In about December 1644, he married Lady Penelope O’Brien (the only daughter of the 5th Earl of Thomond) and they had two daughters. ]
Her husbands bio.
http://wapedia.mobi/en/Henry_Mordaunt,_2nd_Earl_of_Peterborough
another snippet here.
Lestrange is a family connection.
http://www.archive.org/stream/massinghamparua00mclegoog/massinghamparua00mclegoog_djvu.txt