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Assuming the Nordics can get a leader, and roughly around the same time as Rome begin expanding, eventually after consolidating its power in Scandanavia, pressing south and slowly but surely uniting Germany and eastern Europe under there rule over the centuries, until eventually being a major population power house with German and Nordic having intermarried so much that they see eachother as one and the same blood. By 235 BC lets say the two have fought a few bitter wars for the dominance of the British Isles, with the north belonging to Germanica and the south belonging to Rome. And some Persian Empire in the east starting to bug the Roman flank.
Is it plausible, if so, how would they go about doing such a thing?