The Latin alphabet spread together with Western Christianity to the Northern Europe.
It displaced the earlier Runic alphabets used by the people who spoke Germanic languages.
The Latin alphabet was also adapted by the speakers of Baltic languages (Latvian and Lithuanian) and several non-Indo-European (Finno-Ugric) languages (Finnish, Hungarian and Estonian).
During the Middle Ages the Latin alphabet was also adapted by the Western Slavic people (ancestors of modern Czechs, Croats, Poles, Slovenes, and Slovaks), as these peoples adopted Roman Catholicism. Eastern Slavic people generally adopted Cyrillic alphabet along with Orthodox Christianity.