Hornblower also takes on an important passenger in Panama—Lady Barbara Wellesley, the fictional younger sister of Arthur Wellesley (later to become the Duke of Wellington)—also Hornblower's future wife and the love of his life. He is at first nettled and infuriated by her forthright and outspoken manner, her ability to see easily through his reserve, and the great social gap between them. Over time, however, her beauty, strength, and intelligence win his heart, and the two become dangerously attracted to each other. Before things get out of hand, Hornblower informs Lady Barbara that he is married. She leaves the "Lydia" two days later when they rendezvous with other British ships. Hornblower fears for his career, having offended "the daughter of an earl, the sister of a marquis".