The castle is best remembered as a prison for François Bonivard, immortalized by Lord Byron’s poem, The Prisoner of Chillon (https://en.wikisource.org/wiki/Sonnet_on_Chillon#Sonnet_on_Chillon). I particularly like this line: “Freedom's fame finds wings on every wind …”
Geneva established itself as an independent republic in May 1535.
In 1602, another Duke of Savoy, Charles Emmanuel, attempted a surprise attack on Geneva, but was repelled by the Geneva militia – an event celebrated by the annual festival of L’Escalade (which comes up this weekend) - http://www.lake-geneva-switzerland.com/geneve/see-l%E2%80%99escalade-festival-and-celebrations-in-geneva-in-mid-december/.Donna-Lane and I had walked to the castle from the Montreux marché, only to find that the Christmas presentation at the castle would not occur until the weekend (we were there on Wednesday). So I ended up instead with a fascinating history lesson, including how to design a fortress to ward off would-be attackers (if we ever buy a house outside the village, I may consider a moat.)