I'm looking at a will from mid-16C England made by a man who was a member of the Goldsmiths’ Company of London, a merchant of the staple, and one of the two deputy masters of the mint. In other words, a man of substance. One of the beneficiaries and executors is "Bernard Jennyn, skynner of London", who also seems to have been his son-in-law. One of the other executors is a knight and the third an esquire. Normally, a skynner would be someone who works with animal hides, but that can hardly be the case here. So, what can it mean in this context?