Archaeologists recently unearthed the remnants of a historic royal palace from a Polish river, shedding light on a violent part of the country's history.The Museum of Polish History announced the discovery in a Sept. 10 press release. The artifacts were uncovered in the Vistula River in Warsaw, and were connected to the 17th-century royal residence Villa Regia.Officials described Villa Regia as "one of the most magnificent palaces of 17th-century Europe," before it was looted and destroyed during the Swedish Deluge, which lasted from 1655 to 1660.ANGLER EXPECTING A FISH PULLS UP RARE 700-YEAR-OLD SWORD: REAL TREASURESThe Swedish military occupied the Polish-Lithuanian Commonwealth during that time. Historians estimate that as much as a quarter of the population was lost, marking one of the deadliest chapters in the nation's history.In 1656, Swedish troops took valuables from the palace and attempted to sail away but their vessel sank in the Vistula River before they made it out of Warsaw."Architectural elements, from marble claddings and tiles to fragments of monumental staircases, were carried off and some were sunk in the Vistula," the museum said.Among the artifacts retrieved was a fragment of an arcade arch that weighs more than 440 pounds.SURPRISED ARCHAEOLOGISTS UNEARTH ANCIENT GRAVES CAUGHT BETWEEN PAGAN, CHRISTIAN RITUALS IN POLANDArchaeologists also found the fragment of a pillar's capital, or top, which was "previously unknown in the context of finds from this site," per officials."[The finds] will allow new measurements and provide valuable information for reconstructing the royal residence Villa Regia," the museum added."All recovered fragments have been secured and transferred to the collections of the Museum of Polish History, where they will undergo further conservation and research."CLICK HERE TO SIGN UP FOR OUR LIFESTYLE NEWSLETTERKrzysztof Niewiadomski, the Museum of Polish History's deputy director of programs, said that he plans to reconstruct the palace staircase with the artifacts that were retrieved."With this monumental structure, we will tell the story of the power and wealth of the old Polish-Lithuanian Commonwealth, and, by referring to the Swedish Deluge, about the crisis of the state," he noted.MORE FROM FOX NEWS LIFESTYLE"Acquiring such valuable artifacts would not have been possible without good cooperation with archaeologists, the city of Warsaw and the provincial heritage conservator."Poland has been the setting of several exciting archaeological discoveries in 2025.Fox News Digital recently spoke with a hobbyist group in Poland that found ancient treasures while searching for World War II rockets.Earlier this summer, archaeologists in Gdask uncovered an elite knight's burial beneath a former ice cream parlor.