In 1816 Lord Byron and his friend Percy Shelley were sailing on Lac Leman (the French name for Lake Geneva) when they stopped to tour Chateau de Chillon. After walking through the dungeon Byron was inspired to write his sonnet, "The Prisoner of Chillon" chronicling the imprisonment of a Genovois monk, Francois de Bonivard from 1530 to 1536. Bonivard, the Prior of St. Victor's, Geneva, was chained to the in the dungeon of the fortress because he spoke out in favor of the Reformation and the independence of Geneva.
My hair is grey, but not with years, Nor grew it white In a single night, As men's have grown from sudden fears: My limbs are bow'd, though not with toil, But rusted with a vile repose, For they have been a dungeon's spoil, And mine has been the fate of those To whom the goodly earth and air Are bann'd, and barr'd-forbidden fare; But this was for my father's faith I suffer'd chains and courted death; That father perish'd at the stake For tenets he would not forsake;
You can read the entire poem here.