magenta

Magenta was borrowed from French magenta, from Italian Magenta, commemorating the Franco-Italian victory at the Battle of Magenta in 1859. The vivid aniline dye was invented that same year by French chemist François-Emmanuel Verguin, who named it in honor of the battle.

The word began as the name of a town, then became attached to a battle fought there, and only then leapt onto a newly invented dye — turning a place name into a color word.

The town's own name comes from Latin Castra Maxentia, 'the camp named Maxentia,' honoring the emperor Maxentius — much as Castra Regina shows the same pattern of pairing 'castra' with a proper name.