A Jacobus is an English gold coin of the reign of James I, worth 25 shillings.

The correspondence of Isaac Newton refers to the coin:

The Jacobus piece coin’d for 20 shillings is the 41th: part of a pound Troy, and a Carolus 20s piece is of the same weight. But a broad Jacobus (as I find by weighing some of them) is the 38th part of a pound Troy.

More broadly, Jacobus is the Latin form of the English name James.

References

• A Discourse of Coin and Coinage, with some information on the coin.
• Correspondence of Isaac Newton, Warden of the Mint, dated from Jermin Street, Westminster, to John Locke, concerning the weight and fineness of various coins. (September 19, 1698).

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