▁Belg ica ▁( 2 2 ▁BC ), ▁later ▁into ▁ ▁Germania ▁Super ior ▁( AD ▁ 8 3 ). ▁The ▁Hel vet ians , ▁like ▁the ▁rest ▁of ▁Ga ul , ▁were ▁largely ▁Roman ized ▁by ▁the ▁ 2 nd ▁century . ▁ ▁In ▁the ▁later ▁ 3 rd ▁century , ▁Roman ▁control ▁over ▁the ▁region ▁w an ed , ▁and ▁the ▁Swiss ▁plate au ▁was ▁exposed ▁to ▁the ▁inv ading ▁A lem anni . ▁The ▁A lem anni ▁and ▁Burg und ians ▁established ▁permanent ▁settlement s ▁in ▁the ▁Swiss ▁plate au ▁in ▁the ▁ 5 th ▁and ▁ 6 th ▁centuries , ▁resulting ▁in ▁the ▁early ▁medieval ▁territ ories ▁of ▁A lem ann ia ▁( Sw ab ia ) ▁and ▁Upper ▁Burg und y . ▁ ▁Name ▁ ▁The ▁end onym ▁Hel vet ii ▁is ▁mostly ▁derived ▁from ▁a ▁Ga ul ish ▁el u -, ▁meaning ▁" g ain , ▁prosper ity " ▁or ▁" mult itude ", ▁cogn ate ▁with ▁Wel sh ▁el w ▁and ▁Old ▁Irish ▁prefix ▁il -, ▁meaning ▁" many " ▁or ▁" multiple " ▁( from ▁the ▁P IE ▁root ▁* pel h 1 u - ▁" many "). ▁ ▁The ▁second ▁part ▁of ▁the ▁name ▁has ▁sometimes ▁been ▁interpreted ▁as ▁* etu -, ▁" ter rain , ▁grass land ", ▁thus ▁interpre ting ▁the ▁trib al ▁name ▁as ▁" rich ▁in ▁land ". ▁ ▁The ▁earliest ▁att est ation ▁of ▁the ▁name ▁is ▁found ▁in ▁a ▁gra ff ito ▁on ▁a ▁vessel ▁from ▁Mant ua ,