The Frysians (or Frisians says Wikipedia) were a West Germanic tribe. West Germanic tribes consisted of free farmers, who were equals. Unlike the East Germans, they didn't have kings. They had a great sense of freedom and democracy while the Romans were still roaming around in NW Eu. Democracy?? Yes, in times of war they elected a leader, or duke, who after the war would go back to becoming a peer amongst peers once again. And indeed, here comes the catch: all free farmers had a right to to vote, and all had an equal vote. This did not include however (you probably guessed it) the women and the serfs. Much like in Athens: all citizens have the right to vote, but (by far) not all inhabitants of the city are considered citizens.
Everything is relative.
I don't know about Hebrew slaves other than from the story about Ismaels mom. I've never heard about Great Hebrew Conquests and mass captivations though.
Side note: unlike what some want us to believe, ancient slavery had nothing to do with that from the European slave trade. There is no comparison. Apart from the free ride in terms of workforce, in the ancient world enslavement was a means to uproot vanquished peoples from their homeland and to make them and their offspring loyal to their new masters. A kind of forced integration. However they were still considered humans and had rights, if limited ones. In many cases they could buy themselves free, or their children would automatically become fully-fledged members of the winners' society. The Africans dragged off to the Americas weren't considered human and as such had no rights at all. Murdering an African slave wasn't considered a crime and was met with no punishment other than the obligation to compensate the slave's master for his material loss. Did you know that in the 1600s an Irish slave in the West Indies was much cheaper than an African one? (
[link] - a chilling document, that one). Anyway, in ancient times it would depend upon the oppressing society in question and the kind of work one had to do how bad it was. I guess that working in a marble quarry would have worse than serving a Roman senator. In all cases there would have been the aspect of humiliation and subduction involved, which would't have been much fun.
You have a point about the creative buzz. Interesting question. I guess at least they would have looked at it with great pride once the work was finished. Yes, highly organized and pyramidally structured societies can achieve things others can't. Too bad perhaps they dig their own graves in doing so.
I don't know about Frysian art. It would look somewhat like Anglo-Saxon art I guess, which is by all means very pretty. Or perhaps they were just too busy not being oppressed by some bastard monarch to be bothered with it. Frysians and Saxons (the "Brethren of the Sword") are arch enemies btw. They still live next to each other here in Holland, and hate each other with a passion!
I don't know much about art history, I'm afraid. I think I find cave art the most fascinating of all art forms.