Depends on how you define "dominated." They only ruled Motmurk itself, though some (not all) of the Xaric dwarves swore allegiance to them. They were certainly a power in the area, one that nobody could ignore, but they didn't rule the continent.
They were independent. The Osmospondian colonists were at war with them some of the time. I don't know about Ulfhrheim.
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Kwint
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Not quite sure what you're refering to...If its to you, Clueless (a.k.a. Sarah Hood), yeah I'm in on your gender...'Sir' just comes off the tongue ( fingertips? ) easier, which of course requires the correction to 'ma'am'...If not, see confused smiley 
Re: Pre-Harmonium Mot
So, were both Motmurk and Xaric dominated by the Hierarchs of Motmurk prior to Harmonium Era?...Were the Omospondian colonists of the east coast of Xaric independent?...What of Ulfrheim?...Dominated, at war with or Neutral?...
Kwint