Is Hamor a remnant of a breakaway Cyadoran sect or were the ancient Cyadorans heavily influenced by Cyador?

Both, in a sense, in that Hamor was the other continent most strongly influenced besides Candar and because, with the fall of Cyador, a number of refugees settled in Hamor. The Hamorian legal code is a direct crib from that of Cyador, as Kharl finds out in his studies of law.