Short answers, pulled from the story.
The Kingittorsuaq Runestone was discovered in 1824 on Kingittorsuaq Island, in the south-central part of the Upernavik Archipelago in northwestern Greenland. It was found inside one of three stone cairns arranged in a perfect equilateral triangle on the island's mountaintop.
The Kingittorsuaq Runestone has been dated to the Middle Ages, but the exact date remains disputed. The Catholic Encyclopedia assigns the date of the 25th of April, 1135, while other scholars place the stone between 1250 and 1333. The historian Finn Gad has argued that the date inscribed on the stone is ambiguous and can be read in more than one way.
The readable portion of the Kingittorsuaq Runestone records the names of three hunters. The stone was long used as evidence that those hunters over-wintered in the region, but the historian Finn Gad has argued the date cannot be fixed with certainty, which undermines that claim.
Six runes at the close of the Kingittorsuaq Runestone inscription have never been conclusively read. Proposed interpretations range from an encoded year to a phrase meaning 'and wrote runes,' to a magic formula for clearing ice, to a two-part cipher containing both a date and the identity of the carver.
The Kingittorsuaq Runestone is held at the National Museum of Denmark in Copenhagen. It is catalogued as GR 1 in the Rundata record of Scandinavian runic inscriptions.
In 1967, the cryptographer Alf Mongé proposed that two separate cipher systems operate within the stone's final six characters. He argued these ciphers encode both a specific date and the name of whoever carved the inscription.