William O'Brien, 2nd Earl of Inchiquin Irish nobleman (1640–1692) Parents Elizabeth St. Leger Murrough O'Brien, 1st Earl of Inchiquin Children unknown son O'Brien Henry O'Brien Lady Margaret O'Brien William O'Brien, 3rd Earl of Inchiquin Siblings Lady Mary O'Brien Charles O'Brien Lady Elizabeth O'Brien John O'Brien Lady Honora O'Brien Partners Elizabeth Herbert Margareth Boyle
