Gaius Plinius Secundus, Natural Histories  37.7.19  (ca. A.D. 65): Idem in reliquis generis eius quantum voraverit, licet aestimare ex multitudine, quae tanta fuit ut auferente liberius eius Nerone exposita occuparent theatrum peculiare trans Tiberium in hortis, quod a populo impleri canente se, dum Pompeiano proludit, etiam Nerone satis erat. The amount of money squandered by this same man upon other articles of this material in his possession can be gauged from their number, which was so great that, when Nero took them away from the man's children and displayed them, they filled the private theater in his gardens across the Tiber, a theater which was large enough to satisfy even Nero's desire to sing before a full house at the time when he was rehearsing for his appearance in Pompeius' theater. (H. Rackham, trans.)