The Battle of Tolbiac reference article from the English Wikipedia on 24-Jul-2004
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Battle of Tolbiac

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History — Military history — List of battles

The Battle of Tolbiac was fought between the Franks under Clovis I and the Alamanni, traditionally in 496. The site of "Tolbiac", or "Tulpiacum" is usually given as Zülpich, Nordrhein-Westfalen, about 60km east of the present German-Belgian frontier, which is not implausible.

The Franks were successful, and established their hegemony over the Alamanni. Clovis is said to have attributed his success to a vow that he had made: if he won, he would convert to the religion of the Christian God who had aided him. He became a Christian in a ceremony at Reims in 496.