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Italy

Byron wintered in Venice, pausing in his travels when he fell in love with Marianna Segati, in whose Venice house he was lodging, and who was soon replaced by 22-year-old Margarita Cogni; both women were married. Cogni could not read or write, and she left her husband to move in with Byron. Their fighting often caused Byron to spend the night in his gondola; when he asked her to leave the house, she threw herself into the Venetian canal.

In 1816, Byron visited San Lazzaro degli Armeni in Venice, where he acquainted himself with Armenian culture with the help of the monks belonging to the Mechitarist Order. With the help of Father Pascal Aucher (Harutiun Avkerian), he learned the Armenian language and attended many seminars about language and history. He co-authored Grammar English and Armenian in 1817, an English textbook written by Aucher and corrected by Byron, and A Grammar Armenian and English in 1819, a project he initiated of a grammar of Classical Armenian for English speakers, where he included quotations from classical and modern Armenian.

Byron later helped to compile the English Armenian Dictionary (Barraran angleren yev hayeren, 1821) and wrote the preface, in which he explained Armenian oppression by the Turkish pashas and the Persian satraps and the Armenian struggle of liberation. His two main translations are the Epistle of Paul to the Corinthians, two chapters of Movses Khorenatsi 's History of Armenia, and sections of Nerses of Lambron 's Orations. He also translated into English those sections of the Armenian Bible that are not present in the English Bible. His fascination was so great that he even considered using the Armenian version of the story of Cain for his play of the same name. Byron's interest in Armenian studies contributed to the spread and development of that discipline. His profound lyricism and ideological courage have inspired many Armenian poets, the likes of Ghevond Alishan, Smbat Shahaziz, Hovhannes Tumanyan, Ruben Vorberian, and others.

In 1817, he journeyed to Rome. On returning to Venice, he wrote the fourth canto of Childe Harold. About the same time, he sold Newstead Abbey and published Manfred, Cain, and The Deformed Transformed. The first five cantos of Don Juan were written between 1818 and 1820. During this period he met the 21-year-old Countess Guiccioli, who found her first love in Byron; he asked her to elope with him. After considering migrating to Venezuela or to the Cape Colony, Byron finally decided to leave Venice for Ravenna.

Because of his love for the local aristocratic, young, newly married Teresa Guiccioli, Byron lived in Ravenna from 1819 to 1821. Here he continued Don Juan and wrote the Ravenna Diary and My Dictionary and Recollections. Around this time he received visits from Percy Bysshe Shelley, as well as from Thomas Moore, to whom he confided his autobiography or "life and adventures", which Moore, Hobhouse, and Byron's publisher, John Murray, burned in 1824, a month after Byron's death. Of Byron's lifestyle in Ravenna we know more from Shelley, who documented some of its more colourful aspects in a letter:

Lord Byron gets up at two. I get up, quite contrary to my usual custom... at 12. After breakfast we sit talking till six. From six to eight we gallop through the pine forest which divide Ravenna from the sea; we then come home and dine, and sit up gossiping till six in the morning. I don't suppose this will kill me in a week or fortnight, but I shall not try it longer. Lord B.'s establishment consists, besides servants, of ten horses, eight enormous dogs, three monkeys, five cats, an eagle, a crow, and a falcon; and all these, except the horses, walk about the house, which every now and then resounds with their unarbitrated quarrels, as if they were the masters of it.... I find that my enumeration of the animals in this Circean Palace was defective.... I have just met on the grand staircase five peacocks, two guinea hens, and an Egyptian crane. I wonder who all these animals were before they were changed into these shapes.

In 1821, Byron left Ravenna and went to live in the Tuscan city of Pisa, to which Teresa had also relocated. From 1821 to 1822, Byron finished Cantos 6–12 of Don Juan at Pisa, and in the same year he joined with Leigh Hunt and Shelley in starting a short-lived newspaper, The Liberal, in whose first number The Vision of Judgment appeared. For the first time since his arrival in Italy, Byron found himself tempted to give dinner parties; his guests included the Shelleys, Edward Ellerker Williams, Thomas Medwin, John Taaffe, and Edward John Trelawny; and "never", as Shelley said, "did he display himself to more advantage than on these occasions; being at once polite and cordial, full of social hilarity and the most perfect good humour; never diverging into ungraceful merriment, and yet keeping up the spirit of liveliness throughout the evening."

Shelley and Williams rented a house on the coast and had a schooner built. Byron decided to have his own yacht, and engaged Trelawny's friend, Captain Daniel Roberts, to design and construct the boat. Named the Bolivar, it was later sold to Charles John Gardiner, 1st Earl of Blessington, and Marguerite, Countess of Blessington, when Byron left for Greece in 1823.

Byron attended the beachside cremation of Shelley, which was orchestrated by Trelawny after Williams and Shelley drowned in a boating accident on 8 July 1822. His last Italian home was in Genoa. While living there he was accompanied by the Countess Guiccioli, and the Blessingtons. Lady Blessington based much of the material in her book, Conversations with Lord Byron, on the time spent together there. This book became an important biographical text about Byron's life just prior to his death.