Shanidar is known as the dragon of Baratano, but he wouldn't say he ruled Baratano. Most metallic dragons don't like to make claims to authority like that.
It's true, however, that he's the strongest creature in Baratano, and the richest, and the biggest, and that his opinion carries a lot of weight in Baratano because of his strength and wealth and general largeness; not to mention longevity and cultural, traditional role.
No, he wouldn't say he's the *god* of Baratano, either.
Spoiler: History 15+ (adv for Fork and Ttharg)
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The Grin is one of the longest continuously-occupied lairs in the Hic Sunt, changing hands frequently, and under Shanidar Baratano has thrived and enjoyed relative stability. He has smoothed the often-fractitious relationship between the natives of Frogtown, the pirates, the lizardkin fisherfolk, and even the less degenerate of the cultists.
Like any metallic dragon he is not friendly to Lssthp, but there are worse neighbors. Shanidar keeps order in Baratano, in a rough and ready way, and upholds certain unspoken principles. It's lawless, but not ruthless, brutal anarchy.