Sweden and Gothia were two separate nations long before that into antiquity.
It is not known how long they existed, Beowulf described semi-legendary Swedish-Geatish wars in the 6th century.
The Arabic traveller Ibn Fadlan described these Vikings as following: I have seen the Rus as they came on their merchant journeys and encamped by the Itil.
I have never seen more perfect physical specimens, tall as date palms, blond and ruddy; they wear neither tunics nor caftans, but the men wear a garment which covers one side of the body and leaves a hand free.
The last major Swedish Viking expedition appears to have been the ill-fated expedition of Ingvar the Far-Travelled to Serkland, the region south-east of the Caspian Sea.
Its members are commemorated on the Ingvar Runestones, none of which mentions any survivor.
He writes that the Suetidi are the tallest of men—together with the Dani, who were of the same stock.The Byzantine Emperor Theophilos noticed their great skills in war and invited them to serve as his personal bodyguard, known as the varangian guard.The Swedish Vikings, called "Rus" are also believed to be the founding fathers of Kievan Rus.Since there are no official statistics regarding ethnicity in Sweden, the number does not include ethnic Swedes who were born abroad but now repatriated to Sweden, nor does it include Swedish-speaking population of Finland in Sweden; est. In Germania 44, 45 he mentions the Swedes (Suiones) as a powerful tribe (distinguished not merely for their arms and men, but for their powerful fleets) with ships that had a prow in both ends (longships). Sweden enters proto-history with the Germania of Tacitus in 98 AD.
Later he mentions other Scandinavian tribes as being of the same height.