Amadis of Gaul is a work of fiction on the subject of knight-errantry. Little is known about it, and virtually nothing definitively. The author remains unknown, its likely area of origin is Portugal and it was probably written in the early 14th Century.
Several poor sequels were published in the following centuries until Miguel de Cervantes put an end to this. Don Quixote was published as a parody of the trend of these sequels, though both Cervantes and his protagonist, Quixote, hold the original Amadis in very high esteem.