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Described in The Colour of Magic The Arch-Astronomer of Krull was the despotic ruler of the the small and secretive kingdom of Krull, whose rim-most mountains project out over the Rimfall. He ruled in a particularly violent fashion, having those who displeased him sentenced to excruciating deaths, but he did preside over a populace of intelligent and searching individuals. Variously described as cosmochelonians and astrozoologists, many of the Krullians were deeply interested in Great A'Tuin and - specifically - the sex of the great Star Turtle.

Amongst the Arch-Astronomer's other "achievements" are the putting to death of Goldeneyes Silverhand Dactylos, and possibly being eaten by the Luggage.