Le Morte D’Arthur is a compilation of tales of King Arthur and the knights of the Round Table, written by Sir Thomas Mallory in 1485. It is probably the most famous work of Arthurian literature, and many books that followed it use the events and timeline provided by Mallory.
The language in Le Morte D’Arthur is challenging for modern readers. Many find it distracting. Those who would like to read the story in modern English might enjoy The Death of King Arthur by Peter Ackroyd. It is a fairly faithful retelling of Malory’s tale.