Idonia de Clifford

Idonia de Clifford (c. 1300 – 24 August 1365) was a daughter of Robert de Clifford, 1st Baron Clifford, killed at Bannockburn in 1314, and Maud de Clare. In that same year she married Henry de Percy, who as 2nd Baron Percy of Alnwick became one of Edward III's chief wardens of the Scottish marches.

She bore him six sons and four daughters, among them Henry, who succeeded as 3rd Baron Percy, Thomas, bishop of Norwich, and daughters Margaret, Maud and Eleanor, who married into the Ferrers, Neville and FitzWalter families.

Her daughter Isabel married William de Aton. Her husband died in February 1352 and was buried at Alnwick, and Idonia survived him by thirteen years.