They almost killed some of the envoys and became very insistent with Germanicus even seizing his wife Agrippina and his son, both of whom had been sent away by him to some place of refuge. Agrippina was the daughter of Agrippa and Julia, Augustus's daughter; the boy Gaius was called by them Caligula, because, having been reared largely in the camp, he wore military boots instead of the sandals usual in the city. Then at Germanicus' request they released Agrippina, who was pregnant, but retained Gaius.
Edition :
Dio's Roman History. Cassius Dio Cocceianus. Earnest Cary. Herbert Baldwin Foster. William Heinemann, Harvard University Press. London; New York. 1914-.
Notes :
The mutineers turn on each other afterwards, described in: "Roman Mutineers arrest many of their own men."