Valerius Maximus, Memorable Sayings and Deeds, 1.8.12
“Another spectacle for our state was the pyre of Acilius Aviola. Doctors and his servants believed that he was dead since he had stretched out still in his house for some time. When he was taken out for burial, once the fire overtook his body, he yelled that he was alive and asked for help from his teacher—for he had remained there alone. But, because he was already surrounded by flames, he could not be saved from his death.”
1.8.12a Aliquid admirationis civitati nostrae Acilii etiam Aviolae rogus attulit, qui et a medicis et a domesticis mortuus creditus, cum aliquamdiu domi iacuisset, elatus, postquam corpus eius ignis corripuit, vivere se proclamavit auxiliumque paedagogi sui—nam is solus ibi remanserat—invocavit, sed iam flammis circumdatus fato subtrahi non potuit.
Pliny the Elder presents a shortened version of this (Natural History, 1.173)
“Aviola the consul revived on the funeral pyre and since it was not possible to help him because the fire was too strong, he was cremated alive.”
Aviola consularis in rogo revixit et, quoniam subveniri non potuerat praevalente flamma, vivus crematus est