Many people think the term arose because of the dominance of French in diplomatic circles, but I t's actually quite apropos; "lingua franca" is an early medieva

Many people think the term arose because of the dominance of French in diplomatic circles, but I t's actually quite apropos; "lingua franca" is an early medieval term that essentially translates to "language of the Western Europeans" ("Franca" in this context is not modern France, but a term for historical Germany -- everything north of modern Spain, essentially). In the day, lingua franca was a patois consisting of bits of various languages that all traders in the region knew and could communicate in, though it was too mutable to be a stable language as such. Not unlike English, actually!