ObjectsArtifact
Marauder's Map
The Marauder’s Map is a charmed plan of Hogwarts made by James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew. It shows people moving through the castle and names the passages out. Fred and George Weasley give it to Harry, who uses it to reach Hogsmeade and, later, to watch the castle.
First mention
Harry Potter and the Prisoner of AzkabanChapter: The Marauder's Map
Fred and George hand Harry the parchment in the castle and tell him the words that open and insult it.