How did coins from the reigns of Louis the Pious and Charles the Bald end up in Poland?
We did not know about close encounters between Germanic and Slavic tribes prior to the Viking Age. The recent discovery of runes on a Czech cow bone challenges that perception we have so far (see A Cow Bone with Runic Inscription). Similarly, we do not know a lot about the West Slavs in Poland. Dr Leszek Gardeła challenges our perception about the interaction between Vikings and the West Slavs. Some Polish warrior graves dubbed ‘Viking’ might need closer scrutiny for West Slavic influences, though. See Dr Gardeła’s paper on the ever-excellent Medievalists.net.
Just over a month later, First News writes about further discoveries in the area of Poznań, Poland. Under late medieval bridges discovered in 2017, divers discovered complete, tenth-century sword, axes and other weapons. The axe, in particular, looks like Scandinavian counterparts of the time. See also the Microblog post about the discovery of fortifications in the area of Poznań.
In Poznań, Poland, a huge defensive wall dating back to the second half of the tenth century has been found. As a result, archaeologists are rethinking the importance of the city of Poznań during the reign of Mieszko I. See the report of the discovery on First News.
Fine overview of Viking Age Poland, in particular the ninth and tenth centuries. And the connections with the surrounding countries and kingdoms. The full reference is: Mateusz Bogucki, ‘Intercultural Relations of the Inhabitants of Polish Territory in the 9th and 10th centuries,’ in: The Past Societies: Polish Lands from the First Evidence of Human Presence to the Early Middle Ages, edited by Przemysław Urbańczyk (Warsaw: Institute of Archaeology and Ethnology, Polish Academy of Sciences, 2016), pp. 223-276.
The results of the excavations in Ciepłe, Poland have now been published.