GUERNIERI or WERNER (ft. 135o), a celebrated mer cenary captain, was a member of the family of the dukes of Urslingen. He served the Pisans (1340-43), but afterwards col lected a troop of adventurers which he called the Great Company, and with which he plundered Tuscany and Lombardy. He then entered the service of Louis I. the Great, king of Hungary and Poland, whom he assisted to obtain possession of Naples. When dismissed from this service his ravages culminated in the dreadful sack of Anagni in 1358. Guernieri is said to have worn a breast plate with the inscription, "The enemy of God, of pity and of mercy."