The MacEwan problem begins with the entry for August 3, 934 in the Chronology section of the Codex Derynianus, which states that Ewan Duke of Claibourne was succeeded in the Duchy by his eldest son Angus and in the Barony of Marlor by his second son Arran. According to the list of the Dukes of Claibourne (page 57) Angus dies in 1012 and is succeeded by his nephew Tresham (Duke from 1012 - 1025). Logically Tresham would have to be Arran's eldest son, since according to the laws of succession if Angus died without male issue the Duchy would pass to his brother Arran, and then to Arran's eldest son. But the list of the Barons of Marlor (page 162) shows that Arran didn't died until 1025. So why didn't he succeed his older brother as Duke of Claibourne?
To further complicate the issue, when Tresham dies in 1025 he is succeeded in the Duchy of Claibourne by his cousin Keene. However Arran is succeeded by his son Drummond in the Barony of Marlor (and descent continues in the direct male line down to the year 1125). Since Arran has surviving male issue there is no reason for the Duchy to move to a junior branch of the MacEwans.
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