
Fortress on an island rock at the eastern end of Lake Geneva, Switzerland, dating from the 8th century. The 16th-century Genovese republican and patriot François Bonward (Bonnivard) (1496-c....
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http://www.encyclo.co.uk/local/20688

Chillon is a castle, in Switzerland, on the Lake of Geneva, south-east of Vevay. It was once an important stronghold of the Counts of Savoy, and the prison-house of Francis Bonnivard, prior of St Victor, Geneva, from 1530 to 1536. It has acquired interest from Byron's poem, The Prisoner of Chillon.
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http://www.probertencyclopaedia.com/browse/TC.HTM

an ancient castle in W Switzerland, at the end of Lake Geneva.
Found on
https://www.infoplease.com/dictionary/chillon
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