From this later period too (9th and 10th centuries) are several Welsh sources, particularly the genealogies in Harley 3859, which have been too readily accepted at face value. Whatever else they tell us, they do not confirm that someone who was the father of a king was also a king: thus, none of the individuals listed in them can be said to be 'king of Alclut' without corroboration. Furthermore, it is not clear what the sources for these genealogies were, and to what extent they are independent and factual, or how much they relied on much the same evidence we have today; and, if they lacked information, whether they supplied it.