Refused to truckle to the municipality, placed it under an interdict (1155), and allied himself with Frederick Barbarossa to quell an insurrection which respected the rights of emperors no more than the rights of popes.
As the result of negotiations between Frederick Barbarossa and the Romans, Eugenius was finally enabled to return to Rome in December 1152, but died in the following July.
In 1157 an almost circular moat, still preserved in the inner canal or Naviglio, was constructed round the town; but in 1162 Frederick Barbarossa took and almost entirely destroyed the city, only a few churches surviving.
Alessandria was founded in 1168 by the inhabitants of the district in order to defend themselves against the marquis of Monferrato and the town of Pavia, at whose request it was besieged in 1174 by Frederick Barbarossa for six months, but without success.
In Sicily also the Oriental tendencies of Frederick Barbarossa and Frederick II.
The emperor Frederick Barbarossa was the last to wear the insignia (in 1167).
Rendered fealty to the emperor Frederick Barbarossa at Dole in 1162; and when, on the accession of Canute V.
Here Frederick Barbarossa found them in strength in 1189.
In 1865 appeared his monograph on Henry the Lion, duke of Saxony and Bavaria, which was followed by three volumes on the emperor Frederick Barbarossa (Kaiser Friedrich I., Danzig, 1871-1874).
In 1189 Frederick Barbarossa of Germany sought and obtained leave to lead his troops on the third crusade through the Byzantine territory; but he had no sooner crossed the border than Isaac, who had meanwhile sought an alliance with Saladin, threw every impediment in his way, and was only compelled by force of arms to fulfil his engagements.