They are still a Clan-oriented society, though there is a single King which rules all of the clans.  The formal name of their government is the Star Kingdom of Dalriada.  They are the center of the Dalriadan Alliance, an organization not too different from the Federation.  The Dalriada are very territorial, and many are not happy about the Federation's encroachment on traditional lands of their clans.

Their lineage appears to originate in the Celtic tribes of the British Isles and Northern Europe.  They seem to be, basically, Scots and Picts. Their customs, dress, language, culture, and genetics all show signs of this descent. According to Federation geneticists, two millennia away from Earth has given them a significantly different perspective in many affairs. However, at their core they are still very much human, although they have been separated from Earth about as long as the Vulcans and Romulans have been apart.