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Children

Byron wrote a letter to John Hanson from Newstead Abbey, dated 17 January 1809, that includes "You will discharge my Cook, & Laundry Maid, the other two I shall retain to take care of the house, more especially as the youngest is pregnant (I need not tell you by whom) and I cannot have the girl on the parish." His reference to "The youngest" is understood to have been to a maid, Lucy, and the parenthesised remark to indicate himself as siring a son born that year. In 2010 part of a baptismal record was uncovered which apparently said: "September 24 George illegitimate son of Lucy Monk, illegitimate son of Baron Byron, of Newstead, Nottingham, Newstead Abbey."

Augusta Leigh 's child, Elizabeth Medora Leigh, born in 1814, was possibly fathered by Byron, who was Augusta's half-brother.

Byron had a child, The Hon. Augusta Ada Byron ("Ada", later Countess of Lovelace), in 1815, by his wife Annabella Byron, Lady Byron (née Anne Isabella Milbanke, or "Annabella"), later Lady Wentworth. Ada Lovelace, notable in her own right, collaborated with Charles Babbage on the analytical engine, a predecessor to modern computers. She is recognised as one of the world's first computer programmers.

He also had an extramarital child in 1817, Clara Allegra Byron, with Claire Clairmont, stepsister of Mary Shelley and stepdaughter of William Godwin, writer of Political Justice and Caleb Williams. Allegra is not entitled to the style "The Hon." as is usually given to the daughter of barons, since she was born outside of his marriage. Born in Bath in 1817, Allegra lived with Byron for a few months in Venice; he refused to allow an Englishwoman caring for the girl to adopt her and objected to her being raised in the Shelleys' household. He wished for her to be brought up Catholic and not marry an Englishman, and he made arrangements for her to inherit 5,000 lire upon marriage or when she reached the age of 21, provided she did not marry a native of Britain. However, the girl died aged five of a fever in Bagnacavallo, Italy, while Byron was in Pisa; he was deeply upset by the news. He had Allegra's body sent back to England to be buried at his old school, Harrow, because Protestants could not be buried in consecrated ground in Catholic countries. At one time he himself had wanted to be buried at Harrow. Byron was antagonistic towards Allegra's mother, Claire Clairmont, and prevented her from seeing the child.

During his time in Greece, Byron took interest in a Turkish Muslim nine-year old girl called Hato or Hatagée which he seriously considered adopting. Her mother was a wife of a local notable from Messolonghi, who, at the time, was a domestic servant to an Englishman named Dr. Millingen. The rest of the girl's family had either fled or perished after the Greek revolutionaries took over Messolonghi. Byron spent nearly £20 on elaborate dresses for Hato; he considered sending her to Teresa Guiccioli, or to his half-sister Augusta, or to his estranged wife as a playmate for his daughter Ada. Ultimately, Byron sent both Hato and her mother to Cephalonia to be cared for temporarily by his friend James Kennedy; soon after Byron’s death they were reunited with their surviving family.