Frederick Henry is the protagonist of the novel "A Farewell to Arms" by Ernest Hemingway. He is an American ambulance driver in the Italian army during World War I. The story follows his experiences on the front lines and his struggles with love, loss, and the harsh realities of war. Throughout the novel, Frederick develops a romantic relationship with Catherine Barkley, a British nurse. Their love story unfolds against the backdrop of the war, highlighting themes of courage, sacrifice, and the impact of conflict on personal lives. Frederick's character embodies the search for meaning in a chaotic world.