Isabella Mortimer, Countess of Arundel

Isabella Mortimer, Lady of Clun and Oswestry was a noblewoman and a member of an important and powerful Welsh Marcher family. Although often overshadowed in modern historiography by her better-known parents, she is now known to have played an important part in her family's struggles against Llywelyn ap Gruffudd and to have helped to secure the frontline at Shropshire in the run-up to English conquest of Wales. She was the wife and widow of John III FitzAlan, baron of Clun and Oswestry and de jure earl of Arundel. After a lengthy widowhood, she married for a second time and largely disappeared from the records.