The ducat coin was used as a trade coin in Europe from the later Middle Ages to the 19th century. Its most familiar version, the gold ducat or sequin containing around 3.5 grams of 98.6% fine gold, or
Ferdinand III depicted on a 100 Hungarian Ducat (1629)
Austrian four ducats, c. 1915 (official restrike)
Netherlands, 1724 Gold ducat, Utrecht
Sterling is the currency of the United Kingdom and nine of its dependent territories and formerly of the Kingdom of England. The pound is the base unit of sterling, and the word pound is also used to
Ducat
…the centuries. Similarly named silver ducatons also existed. The gold ducat circulated along with the Florentine florin and preceded the modern British pound sterling. The word ducat is from Medieval Latin ducalis = "relating to a duke (or dukedom)", and initially meant "duke's coin" or a "duchy's coin…
Penny of William I, showing the king's head between two stars
King Offa penny (eighth century)
Penny of Henry III, 13th century
Edward III noble (80 pence), 1354–55