Suetonius Tiberius 71

Though he was ready and conversant with the Greek tongue, yet he did not use it everywhere; but chiefly he avoided it in the senate-house, insomuch that having occasion to employ the word monopolium (monopoly), he first begged pardon for being obliged to adopt a foreign word. And when, in a decree of the senate, the word ἔμβλημα (emblem) was read, he proposed to have it changed, and that a Latin word should be substituted in its room; or, if no proper one could be found, to express the thing by circumlocution. A soldier who was examined as a witness upon a trial, in Greek, ¹ he would not allow to reply, except in Latin.