Jacobus

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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 derived from the bible name Jacob which means the wise one

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