Richard III had referred disparagingly in two proclamations to the rebel 'Henry Tydder'; this may well have stung, so that the new King was all the more concerned to establish an honourable lineage for his family. A commission of Welsh genealogists was therefore set up to trace his pedigree. Only the report has survived, to show Henry's descent from medieval Welsh and British rulers. However fantastic its remoter claims, there is no sound reason to doubt its authenticity as an official document. Even Sir Edward Coke in his Fourth Institutes of the Laws of England (1644) accepted its validity and gave as his source for the original commission the patent rolls for Henry VII, though no-one else has found any trace of it there. (The great champion of the common law who set such store by precedents was notoriously careless in his scholarship.) Henry did not draw on this pedigree to confirm the legitimacy of his monarchy, only to embellish it. What was important for him was the historical associations with British, rather than Welsh, royalty. That these also proved to be flattering to the Welsh nation was an incidental and inexpensive form of propaganda.