History of english literature

Canto III
A digression. To give his political opinions about the Ottoman Empire's hegemony upon Greece, in “The Isles of Greece” section of canto III, Byron uses numeration and versification different from the style of verse and enumeration of the text about Don Juan. Moreover, on returning to the adventures of Don Juan, the narrator vividly describes a catalogue of the celebrations of the lovers Haidée and Don Juan. At the time of Juan's ship-wrecked arrival to the island, the islanders believed that Lambro (Haidée's father) was dead, but he returns and witnesses the revels and his daughter in company of a man. Towards the end of canto III, Byron again digresses from the adventures of Don Juan in order to insult his literary rivals, the Lake Poets, specifically William Wordsworth (1770–1850), Robert Southey (1774–1843), and Samuel Taylor Coleridge (1772–1834).
Canto IV
Sold into slavery. On the island, the lovers Haidée and Don Juan wake to discover that her father, Lambro, has returned. Aided by his fellow pirates, Lambro enslaves Juan, and embarks him aboard a pirate ship delivering slaves to the slave market in Constantinople. Haidée despairs at losing her lover, and eventually dies of a broken heart, whilst pregnant with Don Juan's child.
Canto V
The Sultana of Constantinople. At the slave market, Don Juan converses with an Englishman named John Johnson, telling him of his lost love Haidée, whereas the more experienced John tells him of having to flee from his third wife. A black eunuch from the harem, Baba, buys the infidel slaves Juan and John, and takes them to the palace of the sultan. Taking them to an inner chamber, Baba insists that Don Juan dress as a woman, and threatens castration if Juan resists that demand. Finally, Juan is taken into an imperial hall to meet the sultana, Gulbeyaz, a beautiful, twenty-six-year-old woman, who is the fourth, last, and favourite wife of the sultan.
Canto VI
The seraglio. The sultan and the sultana retire for the evening, and Don Juan, still dressed as the woman "Juanna", is taken to the crowded harem, where the odalisques reside. Juanna must share a couch with Dudù, a pretty seventeen-year-old girl. When asked his name, Don Juan calls himself "Juanna". The narrator tells that Dudù is a "kind of sleepy Venus . . . very fit to murder sleep. . . .