One member of this group 
One member of this group of people was depicted on the Ars Pacis, and had earlier served as a cavalry commander for Aulus Gabbinius. One of these people was the grandson of a High Priest (*) and censor of the same name, and tried to raise a revolt in Sicily against another of these people. That man was later confined to governance of Africa, after having had his possessions in Gaul and Spain taken away. Another of these people fought in Syria and lost the battle of Actium. This group first met at Bolonia and was enacted into law in 43 BCE, and was renewed 5 years later. For 10 points, identify this group of people that oversaw the execution of Brutus and was comprised of Marcus Lepidus, Marc Antony, and Octavian.
One member of this group of people was depicted on the Ars Pacis, and had earlier served as a cavalry commander for Aulus Gabbinius.
Second Triumvirate [or Triumviri Rei Publicae Constituendae, or Triumvirs for Confirming the Republic with Consular Power, prompt on "Triumvirate"] (accept Caesars before *)