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In page Richard Grey, 3rd Earl of Tankerville:

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In the Wars of the Roses he was with the Duke of York at the Battle of Ludford Bridge on 12 October 1459. His support for the house of York resulted in him being attainted with many others by the Lancastrian Henry VI in 1460, when the earl of Warwick ordered him to surrender Montgomery castle. All his hereditary titles were abolished by this attainder, bringing an end to this creation of the Earldom of Tankerville. The attainder would also have abolished the title of Baron of Powis.[2] Henry VI reversed the attainder once he had control of the lands, and had received a promise of loyalty.