QUADRIGAE PISONIS
a four-horse chariot erected by order of the senate in honour of a certain Piso Frugi, who is said to have been one of the thirty Roman tyrants. It stood within the area afterwards occupied by the thermae of Diocletian, and was removed when they were built (vit. trig. tyr. 21; RE iii. 1390). v. Domaszewski thinks that the whole story rests on an invention (SHA 1916, 7. A, 9; 1918, 13. A, 41-46).