The Alemanni were a loosely organized confederation of Germanic tribes first mentioned attacking the Roman Empire in AD 213. They occupied territories in modern-day Germany and Switzerland, establishing the German language in those regions. In 496, they were conquered by Clovis and incorporated into his Frankish kingdom.
The Visigoths were branches of nomadic Gothic tribes that flourished in Europe during the decline of the Roman Empire. They invaded Italy under Alaric I and famously sacked Rome in 410. After this, they began settling in southern Gaul and the Iberian Peninsula, where they founded the Kingdom of the Visigoths.
The Angles were a major Germanic people who settled in Britain