One of the more interesting aspects of the coinage of Charles I is the coins from Mintmaster Nicholas Briot. He was later beheaded for counterfeiting.

Some of the most interesting coinage of Charles I came in the latter years just before Parliament caught up with him and eventually handed him his head on a platter. As he was running around the country he would hole up in various cities and castles. While there they would use whatever silver was available, sometimes plates and silverware, cut it up and mint it with the date and the name of the castle. This was to pay the army. These pieces were often lozenge or diamond shape, and occassionally octagonal. These pieces are usually very scarce.