Zaaman Rul
Zaaman Rul, Prince of Good Fire Creatures and Good Elemental Fire, is one of the four Princes of Elemental Good, a band of benevolent Archomentals introduced in Dungeons & Dragons to counter the machinations of the older, more iconic Princes of Elemental Evil: Cryonax, Imix, Ogremoch, Olhydra and Yan-C-Bin.
Unfortunately, the Princes of Elemental Good have never really had the traction of their more malevolent counterparts, in one part because DMs rarely have as much use for goodly monsters as they do for malign ones (evil parties are, after all, the rarity in D&D) and in another part because they really exemplify the complaints many D&D fans make of Planescape relying a little too heavily on grid-filling.
2nd Edition
The Princes of Elemental Good first appeared in the Monstrous Compendium Appendix 3 for Planescape.
3rd Edition
The 3rd edition update for all of the Princes of Elemental Good happened in issue #353 of Dragon Magazine