If the hypothesis is correct, what then would have inspired the later chroniclers to add bogus information?
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The earliest available source, the late 10th century Pictish Chronicle Cronica de Origine Antiquorum Pictorum which records events up to 995, contains a bare outline of the names of the kings with some incomplete information about their affiliations and events during their reigns.
In particular, the Cronica de Origine includes no information about how King Aedh and King Indulf were related to the main family line.
The only reference to succession practice which has been found is the report in the Chronicle of John of Fordun which states that King Kenneth II decreed a change to enable "the nearest survivor in blood to the deceased king to succeed".
The move would obviously have been unpopular in the wider royal family, and King Kenneth was not powerful enough to carry it through, as shown by his murder in 995, alleged in the same source to have been committed by his collateral relatives.
The early history of Scotland is characterised by the absence of contemporary Scottish sources before the 10th century.