Les Adieux Sonata

Context is everything. Ludwig van Beethoven dedicated his 26th piano sonata to Archduke Rudolph of Austria. The nickname of the sonata is "Les Adieux" or "Farewell," and I've heard speculation on the supposed relationship between the composer and his patron and friend.

Just knowing the title page on the first edition helps clarify some facts: "On the departure of his imperial highness, for the Archduke Rudolph, in admiration."

Why was his highness leaving? War.