Question: Who is Washington Shirley, 2Nd Earl Ferrers's paternal grandmother?
Sentence (from "Robert Shirley, 1st Earl Ferrers"): In 1692, Ferrers and Thynne (the latter now Viscount Weymouth) decided to partition the Barony of Farney in County Monaghan, both possessing an equal moiety of it as coheirs of Robert Devereux, 3rd Earl of Essex.
Relevant evidence: No