According to the history of the Clapham family maintained by the College of Heralds, in 965 AD King Edgar of England gave a grant of land at Clapham to Jonas, son of the Duke of Lorraine, and Jonas was thenceforth known as Jonas "de [of] Clapham". The family remained in possession of the land until Jonas' great-great grandson Arthur sided against William the Conqueror during the Norman invasion of 1066 and, losing the land, fled to the north (where the Clapham family remained thereafter, primarily in Yorkshire).
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Which Duke of Lorraine during this time frame had a son named Jonas?
Who was Jonas's father?