How Conquest Shaped Northern Europe's Languages

Conquests profoundly reshaped the linguistic map of Northern Europe:

Roman conquest (Britain, Germania): Introduced Latin; loanwords in Celtic/Germanic languages (e.g., English street, wine, wall from Latin strata, vinum, vallum).
Anglo-Saxon settlement (5th–7th c.): Brought Old English (West Germanic), displacing Brittonic Celtic in what became England.
Viking Age (8th–11th c.): Old Norse influx in N. England, Scotland, Ireland; place names (-by, -thorpe, -thwaite), pronouns (they, them, their), everyday words (sky, egg, knife, take).
Norman Conquest (1066): Norman French became elite language; ~10,000 French words entered English (law, government, cuisine, arts).
Germanic expansion (Ostsiedlung, Teutonic Order): German spread east into Baltic, Poland, Czechoslovakia; Yiddish developed.
Russian imperial expansion: Russian became dominant across Siberia, Caucasus, Central Asia.
Slavic migrations/conquests: Polish, Czech, Slovak expanded; Baltic languages (Prussian) extinct.
Celtic retreat: Cornish, Manx extinct as community languages; Welsh, Breton, Irish, Scottish Gaelic minoritized.