Here Lies Arthur is a young-adult novel by Philip Reeve, published by Scholastic in 2007. Set in fifth or sixth century Britain and the Anglo-Saxon invasion, it features a girl who participates in the deliberate construction of legendary King Arthur during the man's lifetime, orchestrated by a bard. Reeve calls it a back-creation: not a genuine historical novel as it is not based on actual specific events; rather it is "back-created" from the legends, giving them a "realistic" origin.

In Arthurian legend, Kay is King Arthur's foster brother and later seneschal, as well as one of the first Knights of the Round Table. In later literature he is known for his acid tongue and bullying, boorish behaviour, but in earlier accounts he was one of Arthur's premier warriors. Along with Bedivere, with whom he is frequently associated, Kay is one of the earliest characters associated with Arthur. Kay's father is called Ector in later literature, but the Welsh accounts name him as Cynyr Ceinfarfog.