Sir David has been knighted by the king during the wars, but whereas Sir Watkyn's knighthood was for a clear (and expensive) service, the reason for Sir David's is less clear. The nearest to it that anyone has been able to come is that Sir David performed some surgery for His Majesty, but his discretion was ensured for ever by the award of the knighthood.
Sir David abandoned surgery after his knighthood, and now has a considerable wealth which arises from a variety of enterprises. He spends much of his time persuading his friend Sir Watkyn not to worry about the investments Sir Watkyn has made in these enterprises.
Sir David is keen for Sir Watkyn to invest in a new shipping enterprise - a risky project at any time, but during the period of the war it is especially so!