The bearers of this northern Iron Age culture were likely speakers of Germanic languages. The stage of development of this Germanic is not known, although Proto-Germanic has been proposed. The late phase of this period sees the beginnings of the Migration Period, starting with the invasions of the Teutons and the Cimbri until their defeat at the Battle of Aquae Sextiae in 102 BC, presaging the more turbulent Roman Iron Age and Migration Period.