Question: What island is part of the Islands of Furness and has a castle that was used as a base by the Yorkist pretender Lambert Simnel in 1487?
Sentence (from "Martin Schwartz (mercenary)"): Martin Schwartz (died 16 June 1487) was a German mercenary who died at the Battle of Stoke Field while fighting for Lambert Simnel, a Yorkist pretender to the English throne.
Relevant evidence: No