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In page Neustria:

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The predecessor to Neustria was a Roman rump state, the Kingdom of Soissons.[citation needed] In 486 its ruler, Syagrius, lost the Battle of Soissons to the Frankish king Clovis I and the domain was thereafter under the control of the Franks. Constant re-divisions of territories by Clovis's descendants resulted in many rivalries that, for more than two hundred years, kept Neustria in almost constant warfare with Austrasia, the eastern portion of the Frankish Kingdom.