The seven day week and the connection to planets came from Babylon or Egypt, way back. And then via the Greek and so on. The Romans weren't actually the quickes

The seven day week and the connection to planets came from Babylon or Egypt, way back. And then via the Greek and so on. The Romans weren't actually the quickest to adopt it, they had an 8-day week (possibly from the Etruscans), which had to fight with the (also known) 7-day week. It's unclear when the 8-days week completely fell out of favour, but the 7-day week didn't become official until AD 321 (https://en.wikipedia.org/wiki/Eight-day_week https://en.wikipedia.org/wiki/Eight-day_week) In any case, the 7-day week spread, and much farther than just to the north of Europe. China apparently imported the Hellenistic system as far back as the 4th century (wikipedia), and Japan got it four centuries later (but wasn't made official until 1876. The week day names matches the Latin ones, with Monday as "moon day" and so on).