The Callisto series is a sequence of eight science fiction novels by Lin Carter, of the sword and planet subgenre, first published by Dell Books from 1972-1978.
Physically, Callisto's inner hemisphere, illuminated by Jupiter, is lushly vegetated, its land surface covered mostly by jungle and plain which drain into two seas, one large and one small.
On Callisto, Jandar contends with monstrous creatures, savage insect men, barbarian hordes, sky pirates in flying ships, and the dangerous Mind Wizards of Kuur while seeking to rescue and win the heart of the beautiful princess Darloona of Shondakar (a homage to the similarly named Martian lost city in Leigh Brackett's The Last Days of Shandakor).
The texts of the first five volumes of the series are ostensibly transcripts of first-person narratives by Jonathan Dark recounting his adventures, written with native materials and transported back to Earth via the well.
[2] Reviewing the first three volumes, Lester del Rey found the series to be "fairly entertaining reading," but noted that Carter had "copied every trick of Burroughs, including those that are faults.