Thegn (thane)
The Thegn is the hereditary monarch of the Dumein Dominion. It does not necessarily pass to the oldest son or oldest child, but a thegn is expected to name a successor from among their own children or their closest relatives (nephews, nieces, then cousins). The only stipulation is that the title must pass to the next generation, not laterally within the same generation (except in very rare circumstances of early death after having ruled only a couple years). The current thegn is Oswold IX, who took the throne in 1475 2A.
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