COPENHAGEN, Denmark (AP) — Vikings had windows — usually only associated with medieval churches and castles — meaning Norsemen dignitaries sat in rooms lit up by apertures with glass, Danish researchers said Thursday. The glass panes can be dated from long before the churches and castles of the Middle Ages with which glazed windows are associated, they said.

“This is yet another shift away from the image of unsophisticated barbaric Vikings swinging their swords around,” said Mads Dengsø Jessen, a senior researcher with the National Museum in Copenhagen.

Over the past 25 years, archeologists have found glass fragments in six excavations in southern Sweden, Denmark and northern Germany.

In Copenhagen, 61 fragments of glass panes have been analyzed and researchers concluded that the pieces of glass can be dated from long before the churches and castles of the Middle Ages and that Vikings had windows with glass panes between 800 and 1100. The Viking Age is considered to be from 793 to 1066.