Well ... With regards to tax, it might be worth looking into the new tax offices that were set up during the mediaeval period ... was there one set up in the 15th Century? if not ...

As an aside, one wonders if tax demands were printed in the 15th Century ... not likely! Only really important documents were being printed until well into the next century. (as far as I recall, tax demands were still being essentially hand-written in the 1980s).

;-)
Ian