Aleister Portillon

 was the thirteenth Earl of Wetstone, and a close ancestor of Squire Claude Portillon. He was overseeing excavation at Tranchard's Folly when he was attacked by a creature, but managed to survive by playing dead. He had the complete works of Lord Byron including a biography of Mary Shelley. He helped Mary find information on the Varaxyls in the TARDIS library, and managed to gain the Witch Star configuration from Lucern and Finicia, enabling Mary to destroy them. Mary left him the TARDIS' biography of herself, before departing with the Eighth Doctor. (AUDIO: The Witch From the Well)