Old English

Old English (Englisc), also called Anglo-Saxon,^[1] is an early form of the English language that was spoken and written in parts of what are now England and south-eastern Scotland between at least the mid-5th century and the mid-12th century. What survives through writing represents primarily the literary register of Anglo-Saxon. It is a West Germanic language and is closely related to Old Frisian. It also experienced heavy influence from Old Norse, a member of the related North Germanic group of languages.

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Eald Englisc

Here is the Wikipedia page that's written entirely in Old English (also known as Eald Englisc). Now, mind you, this is very different from modern english, and to understand it you'd need to study it like another language.

Eald Enlisc Wicipaedia