Montesquieu
 

XXXI.30 How the empire left the house of Charlemagne

The empire, which, to the pre­ju­dice of the branch of Charles the Bald, had already been given to the bas­tards of the branch of Louis the German,1 again pas­sed into a foreign house with the elec­tion of Conrad, duke of Franconia, in the year 912. The branch that was rei­gning in France, and which could barely contest vil­la­ges, was even less in a posi­tion to contest the empire. We have an agree­ment pas­sed bet­ween Charles the Simple and the empe­ror Henry I, who had suc­cee­ded Conrad. It is cal­led the Bonn com­pact.2 These two prin­ces went aboard a ship that had been posi­tio­ned in the middle of the Rhine and swore an ever­las­ting friend­ship. They made a rather good com­pro­mise. Charles took the title of king of Western France, and Henry king of Eastern France. Charles contrac­ted with the king of Germania, and not with the empe­ror.

Arnoul and his son Louis IV.

In the year 926, recorded by Aubert le Mire, Codex donationum piarum, ch. xxvii.