 Complete the following phrase:  Single combat is mentioned quite frequently in the history of ancient Rome  Romulus defeated Acro, king of Caenina for the spolia opima; the Horatiis defeat of the Alba Longan Curiatii in the 7th century BC is reported by Livy to have settled a war in Romes favor and subjected Alba Longa to Rome; Aulus Cornelius Cossus defeated Lars Tolumnius, king of the Veientes in single combat and took the spolia opima. In the 5th century BC; Marcus Claudius Marcellus took the spolia opima from Viridomarus, king of the Gaesatae, at the 