Helium

Helium is a fictional kingdom featured in the Warlord of Mars multimedia franchise as first envisioned by author Edgar Rice Burroughs. It first appeared in the 1912 serial A Princess of Mars and has remained a principal setting in all further installments in the series as well as adaptations.

Description
Helium is a major kingdom and later a city-state located on the planet Mars. It is ruled by the Red Martians, who are sentient humanoids, virtually indistinguishable from Earthlings apart from their red-hued skin. The chieftain of Helium bears the title of Jeddak. One of the more notable Jeddaks of Helium was Tardos Mors, who was the father of princess Dejah Thoris. Helium is known for its culture, its architecture and its technological advances for its military, which includes a naval force.