Who made the map of lonely mountain in the hobbit?

The map of the Lonely Mountain in "The Hobbit" was created by Thorin Oakenshield's grandfather, Thrain II. The map is significant as it details the secret entrance to the mountain and includes markings related to the key that opens it. Bilbo Baggins and the company of dwarves use this map during their quest to reclaim the Lonely Mountain from the dragon Smaug.