George Gordon Byron is a celebrated British poet and English Lord known for his sweeping literary works and infamous personal life. He moves through high society with a mixture of charm and cynicism, often finding himself caught in romantic scandals. As the speaker of the autobiographical poem, he struggles with feelings of jealousy and hypocrisy after learning of a former lover's new affair.

Lady Frances is a young, married woman who engages in an intense but brief flirtation with Byron. She wishes to protect her marriage and social standing, which stops her from fully committing to the poet. Her subsequent actions make her the target of harsh societal gossip and the primary subject of Byron's bitter verses.

James is a friend of Byron and the husband of Lady Frances. His friendship with the poet inadvertently sets the stage for the flirtation between his wife and his friend. He later asks Byron for assistance in mending his strained marriage.

Arthur Wellesley is a prominent military figure who becomes involved with Lady Frances. His successful courtship of Frances sparks fierce gossip in high society. This involvement serves as the main cause for Byron's deep feelings of jealousy.

Lady Anne is a confidante and correspondent of Byron. She moves in the same elite circles as the poet and the Websters. She receives the crucial letters from Byron where he admits the true timeline and inspiration behind his famous lyric poem.

Caroline Lamb is an influential society figure who shares an obsessive romantic history with Byron. She frequently engages in gossip and actively shapes public opinion regarding the poet's controversial behavior. Fearing for Byron's reputation, she encourages him to visit the Websters.

Augusta is Byron's half-sister, with whom he reconnects after living apart as children. Their socially disastrous relationship threatens Byron's reputation and prompts his friends to encourage him to seek a more suitable arrangement.

John Cam Hobhouse is a loyal classmate whom Byron meets during his school years at Harrow. He remains a steadfast companion through the poet's various travels and social controversies. He arrives in Switzerland to join Byron's traveling party.

Annabella is the woman Byron marries at the encouragement of his friends. She attempts to build a stable family with the famous poet but faces the reality of his continuing scandals.

Percy is a fellow Romantic poet who befriends Byron during their time at Lake Geneva. The two writers share creative challenges and mutual respect. They spend their time indoors exchanging ideas and working on their respective literary projects.

Teresa is a young Countess married to a man almost forty years her senior. She becomes deeply involved with Byron during his time in Italy. The poet relocates to Ravenna specifically to remain close to her.

Captain John is George's father. He struggles with debt and relies heavily on his wife's fortune. He eventually travels to France, leaving his young son behind.

Catherine is George's mother and a Scottish heiress. Her personal funds are depleted by her husband's financial troubles.

Ada is the only child of George Gordon Byron and Annabella Millbanke.

Mary is the fiancée of Percy Bysshe Shelley. She stays at the villa near Lake Geneva with Byron's party, where she writes her own novel during a creative challenge.

Claire is Mary Godwin's half-sister. She becomes involved with Byron while in London and later gives birth to his child in England.

Clara is the child of George Gordon Byron and Claire Clairmont. She travels to Italy, where Byron agrees to support her education in a convent.

John is a classmate Byron meets at Harrow School. He shares an early, intimate connection with the young poet during their school years.

Mary is a classmate of Byron at Harrow School. She shares an early intimate connection with the young poet.

Leigh is a fellow poet who visits Byron in Pisa. He works alongside Byron to start a newspaper called The Liberal.

Edward is a friend who visits Byron in Pisa alongside Percy Bysshe Shelley.