It is referred to as Amphitheatrum in an inscription of the Arval Brethren from the year 80 (Corpus Inscriptionum Latinarum 6.2059=32063=Inscriptiones Latinae Selectae 5049) and in the earliest Latin authors who mention the building (Martial, De Spectaculis 1.7 and 2.5; Suetonius, Vespasian 9.1, Titus 7.3, Domitian 4.1).