The rise of the Caliphate
posed a great threat to all of Europe, and it prompted the Germanic tribes to move closer together and align against the threat. In the late 900's, the kingdoms of Denmark, Norway and Sweden united under a single crown, establishing the Kingdom of the North, which then set on to unite most Germanic tribes. In the progress of incorporating more and more Germanic land, the Kingdom of the North also conquered large Celtic and Slavic lands, becoming a powerful empire by 1200 AD. With much of Northern and Central Europe in its hands, the Nordic Empire became a threat to the Caliphate, and conflict ensued between the two. Civil unrest in former Gaul paved the way for a Nordic takeover of the northern part of the region, but while waging war against the Caliphate, the empire was increasingly threatened by Slavic uprisings and foreign invaders. Eventually, the empire would lose much of its land in Eastern Europe, but it remained as an important power for a long time.
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