Adrathorpe existed within the Expansion Region of the galaxy. The Burke's Trailing smuggling hyperspace route linked it to both the planet Jakku and the moon Jedha. On Adrathorpe, Queen Maz Kanata, the pirate, kept some of the profits from her time as a ruler inside a hidden underground vault.
As of when Kanata started to pen the book that would eventually be called the Smuggler's Guide, the antitamper sub-space alarm protecting the vault had not been triggered; she included Adrathorpe's location, as well as the locations of her other treasure stashes, on a map within the book, hoping that a deserving reader might day discover them.
The first reference to Adrathorpe occurred in Star Wars: Smuggler's Guide, a reference work authored by Daniel Wallace and published in 2018.