# Guillaume Brouscon

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A [world map](/source/Ancient_world_maps) by Guillaume Brouscon, an example of a [Dieppe map](/source/Dieppe_maps), 1543.

Brouscon's Almanach of 1546: Compass bearing of high waters in the [Bay of Biscay](/source/Bay_of_Biscay) (left) and the coast from [Brittany](/source/Brittany) to [Dover](/source/Dover) (right).

Brouscon's Almanach of 1546: Tidal diagrams "according to the age of the Moon".

**Guillaume Brouscon** was a Breton [cartographer](/source/Cartographer) of the [Dieppe school](/source/Dieppe_school) in the 16th century.[1] He was from the port of [Le Conquet](/source/Le_Conquet), near [Brest](/source/Brest%2C_France),[2] which is shown prominently in large red lettering on his 1543 map of the world.

On his 1543 map of the world, the northern part of the promontory of the *TERRE OSTRALE* (Australe) is called *terre de Lucac* (the Land of Locach), and is separated from *[La Iave grande](/source/Jave_la_Grande)* and *[Iave](/source/Java)* by the *R. grande.* That is, Brouscon, like [Mercator](/source/Gerardus_Mercator), identified [Fine](/source/Oronce_Fin%C3%A9)'s *[Regio Patalis](/source/Regio_Patalis)* not with Java Major but with [Locach](/source/Locach).[3]

He published his Brouscon's [Almanachs](/source/Almanac) in 1546, which were used for their information on [tides](/source/Tides) by English, French and Breton sailors. They allowed to known the direction of tidal currents, and to calculate tide level depending on the phase of the [moon](/source/Moon).[2]

## Notes

1. **[^](#cite_ref-1)** Roger Hervé, *Le pilote et cartographe Guillaume Brouscon, du Conquet vers 1540-1550,* 1984; Hubert Michéa, *Les cartographes du Conquet et le début de l'imprimerie. Guillaume Brouscon, une vie pleine de mystère,* Société archéologique du Finistère, 1986; Hubert Michea "Le cartographe conquetois Guillaume Brouscon et la géopolitique: 1543-1548", Comité des Travaux Historiques et Scientifiques, Section d'Histoire des Sciences et des Techniques, *Lyon, Cité de Savants,* Paris, Editions du CTHS, 1988.

1. ^ [***a***](#cite_ref-Cartwirght_2-0) [***b***](#cite_ref-Cartwirght_2-1) [*Tides: a scientific history* David Edgar Cartwright p.18](https://books.google.com/books?id=78bE5U7TVuIC&pg=PA18)

1. **[^](#cite_ref-3)** Robert J. King, "Finding Marco Polo's Locach", *Terrae Incognitae,* vol.50, no.1, April 2018, pp.1-18, p.8.

Authority control databases International ISNI VIAF National France BnF data

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