She is notable for helping to create the powerful medieval house of the FitzAlans.
Isabella married William FitzAlan, the lord of nearby Oswestry, as his second wife in 1156.
The combined lordship of Oswestry and Clun was a significant power in the borderlands with Wales.
[3] Isabella had married Geoffrey de Vere II, brother of the earl of Oxford by early 1166.
[4] A charter of Isabella's to Wenlock Priory in Shropshire, purportedly issued on her deathbed, granted the church and chapels of Clun to that monastery.