Lagis

Lagis lived in Klimtenburg in the 19th century. She acquired a brooch from Vadim and Nefta which, unknown to any of them, was made of metal from a Cyber-ship's Hapthoid reactor unit which was damaged when the Cybermen crashed in Klimtenburg some centuries earlier. She refused to give away her brooch to Heini when the Eleventh Doctor and Olga Bordmann set out to collect all the jewellery, but the Doctor convinced her to part with it after casually warning her she would die of radiation poisoning if she kept it. (PROSE: Plague of the Cybermen)