Question: Who is Una Ross, 25Th Baroness De Ros's maternal grandmother?
Sentence (from "Henry FitzGerald-de Ros, 21st Baron de Ros"): Baron de Ros( 12 June 1793 – 28/29 March 1839) was a British nobleman, the son of Lord Henry FitzGerald and his wife Charlotte FitzGerald- de Ros, 20th Baroness de Ros. Fitzgerald- de Ros briefly served as Member of Parliament for the borough of West Looe from 1816 to 1818.
Relevant evidence: No