Seeking to mend his failing fortunes, the Weif went to France to support his ally, the English king John, against Philip Augustus, and at the battle of Bouvin~s (July 27, 1214) memorable in the history alike of Germany, of England and of France, his fate was sealed, although until his death in May 1218 he maintained a desultory warfare against Frederick.
The two chief collections which were issued by the philosopher are the Accessiones historicae (1698-1700) and the Scriptores reruni Brunsvicensium; the latter of these, containing documents centring round the history of the Weif family, was published in three volumes at Hanover (1707-1711).
Affied through his mother to the Welfs of Bavaria, and anxious to put an end to the unrest which dominated Germany, especially to the strife between the families of WeIf and Hohenstaufen, Frederick began his reign by promising to secure for Henry the Lion the duchy of Bavaria, and by appeasing Henrys uncle, Count Welf, by making him duke of Spol.eto and margrave of Tuscany.
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