What the heck are you comparing Rus' to Ancient Greece for?
Could you elaborate on the Arab orcs? Where is it mentioned? And what is their fate?
Very little is known about them.
On the official website, in the Stronghold section, there is the following line:
"At the time of the Second Eclipse, the Orcs have gained their freedom and divided themselves into three separate tribes: some went north-east to the plains of Ranaar, other exiled themselves deep south in the perilous deserts of Sahaar and the rest sailed south-east across the Jade Sea, to settle in the Pao islands."
Translation: "By the time of the Second Eclipse, the Orcs had already won their freedom and divided themselves into three different tribes: some went northeast to the plains of Ranaar, others exiled themselves deep south in the perilous deserts of Sahaar, and the rest sailed southeast across the Jade Sea to the shores of the Pao Islands."
In general, Xaar once wrote an interesting article about orcs. It even contains some old concept art of Arab orcs.
Here it is: http://www.liveinternet.ru/users/eugene_xaar/post141559645/