JACOBUS, a gold coin, worth 25 shillings; so called from king James the first of England, in whose reign it was struck. See COIN.
We usually distinguish two kinds of Jacobus, the old and the new; the former valued at 25 shillings, weighing six pennyweight ten grains: the latter, called also Carolus, valued at 23 shillings; in weight five pennyweight twenty grains.