The carolus was an ancient gold coin, struck in the reign of Charles I of England. It was originally valued at 20 shillings, but later 23. The name has also been used for various other currencies bearing Carolus (Charles) as the name of the ruler.[1][2]
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This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). Cyclopædia, or an Universal Dictionary of Arts and Sciences (1st ed.). James and John Knapton, et al. {{cite encyclopedia}}: Missing or empty|title=(help) - ^ "Card". Oxford English Dictionary. Oxford University Press. 2nd edition. 1989.