# Jacobus

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English gold coin of the reign of James I

For other uses, see [Jacobus (disambiguation)](/source/Jacobus_(disambiguation)).

A **Jacobus** is an English [gold coin](/source/Gold_coin) of the reign of [James I](/source/James_I_of_England), worth 25 [shillings](/source/Shillings) (1+1⁄4 [pound sterling](/source/Pound_sterling)).[1] The name of the coin comes from the Latin inscription surrounding the King's head on the obverse of the coin, IACOBUS D G MAG BRIT FRA ET HI REX ("James, by the grace of God, of Britain, France, and Ireland King").

[Isaac Newton](/source/Isaac_Newton) refers to the coin in a letter to [John Locke](/source/John_Locke):[2]

The Jacobus piece coin'd for 20 shillings is the 41st: 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.

These correspond to masses of 9.10 and 9.82 [grams](/source/Gram) respectively, making the broad Jacobus slightly heavier.

## References

- [Money portal](https://en.wikipedia.org/wiki/Portal:Money)

1. **[^](#cite_ref-1)** ["*A Discourse of Coin and Coinage*"](https://web.archive.org/web/20041122154646/http://www.public-domain-content.com/books/discourse_coin_coinage/9.shtml). Archived from [the original](http://www.public-domain-content.com/books/discourse_coin_coinage/9.shtml) on 22 November 2004. Retrieved 3 November 2005.

1. **[^](#cite_ref-2)** [Letter of Isaac Newton](http://www.gold.org/download/value/reserve_asset/history/monetary_history/vol1pdf/1698sep19.pdf) dated September 19, 1698, to [John Locke](/source/John_Locke), concerning the weight and fineness of various coins.

v t e Coins of England Silver Sceat Styca Penny (to 1066, 1066–1154, 1154–1485, 1485–1603, 1603–1707) Farthing Groat Shilling Threepence Sixpence Three farthings Three halfpence Crown Half crown Gold Thrymsa (7th century) Mancus (c.796-1016) Gold penny (1257) Noble (1344) Florin (1344) Half florin (1344) Quarter Florin (1344) Angel (1465) Sovereign (1489) Crown of the Rose (1526) Half crown (1526) Half sovereign (1544) Jacobus (James I) Rose Ryal (1604) Spur ryal (1604) Unite (1604) Laurel (1619) Half laurel (1619) Carolus (Charles I) Triple unite (1642) Fifty shillings (1656) Broad (1656) Guinea (1663) Copper and tin Farthing Coins of England category

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Adapted from the Wikipedia article [Jacobus](https://en.wikipedia.org/wiki/Jacobus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Jacobus?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.