Ælle is recorded in early sources as the first king of the South Saxons, reigning in what is now called Sussex, England, from 477 to perhaps as late as 514. The information about him is so limited that it cannot be said with certainty that Ælle existed.

Ælle and three of his sons are reported to have arrived from the continent near what is now Selsey Bill—the exact location is under the sea, and is probably the shoals currently known as the Owers—and fought against the Britons. A victory in 491 at present day Pevensey is said to have ended with the Saxons slaughtering their opponents to the last man. Although the details of these traditions cannot be verified, evidence from the place names of Sussex does make it clear that it was an area with extensive and early settlement by the Saxons, supporting the idea that this was one of their early conquests.

Ælle was the first king recorded by the 8th century chronicler Bede to have held " imperium", or overlordship, over other Anglo-Saxon kingdoms. In the late 9th-century Anglo-Saxon Chronicle (around four hundred years after his time) Ælle is recorded as being the first bretwalda, or "Britain-ruler", though there is no evidence that this was a contemporary title. Ælle's death is not recorded, and it is not known who succeeded him as king of the South Saxons.

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