You know when a poem is a big deal because it'll have it's own Wikipedia page. Said page isn't wrong when it says that "Henley's literary reputation rests almost solely on this single poem." It's kinda huge. Those last lines in particular - "I am the master of my fate, I am the captain of my soul," - are the stuff English Literature is made of.
But hey, let's be honest: we only know about it because it was in Casablanca.
Author: William Ernest Henley •
Year: 1888 •