The Hercules-Cacus episode has a special place in the Aeneid VIII, a singularly episodic book. It is different in its character from other "ecphrases" like I. 45393, VI. 20-34 and VIII. 626-728, because it doesn't have any apparent connection with the preceding or following actions, despite the fact that it has the scale of an independent story and can be called an "aristeia" in an elaborately refined style. The typological theory of Galinsky and Buchheit that Hercules and Cacus symbolize Aeneas and Turnus respectively is very helpful in understanding the meaning and function of this episode, but it seems there are still some missing points to mention. , 1) The Cacus episode also plays a certain role in the contrastive composition of the motives in Book 2 and Book 8. In Book 2, after Hector's warning in Aeneas' dream, the Trojans, who believed they had won the war, met suddenly with a reverse of fortune. In Book 8, the pensive mood of Aeneas changed into a valiant declaration against the Latins and Turnus, after Tiberinus' apparition in his dream and the Cacus episode. In this contrasting composition, Hercules' victory over Cacus, the preliminary presentation of Aeneas' victory over Turnus, should be regarded as the counterpart of the Trojans' miserable defeat and flight in Book 2. It also should be noted that the similar descriptions in VIII. 236 ff. and II. 479 ff. have the contrary effects on the Trojans. A similarly arranged contrast is seen also between VIII. 264 ff. and II. 557 ff. The motive of "dolus"-the intrigue of Ulixes and Sinon, and that of Cacus-is another example of the same motive with different effects between those 2 books. 2) The relationship between Volcanus and Cacus, which might have been an invention of Virgil, should be taken into account in order to understand the function of this episode and Book 8. In Book 8, after the episode in which Hercules (who symbolizes Aeneas) kills Cacus is told, Volcanus, the father of Cacus, makes a weapon for Aeneas. Virgil's aim to make the plot in this ironical way should be interpreted with the aid of the ambiguous character of Volcanus, the deity of fire. In the strife with Hercules, Cacus uses his fire and smoke to defend his monstrous and evil being, but suffers a defeat. Then, Volcanus uses his fire for making Aeneas' weapon, which has a special importance in winning the war to construct Rome. Fire can be an instrument for both construction and destruction, and in those two episodes it is shown that the meaning of fire for the Trojans is changed. It is notable that before the Cacus episode, three of the four usages of "Volcanus" have the meaning of flame, which, in those situations, works negatively against Aeneas or the Trojans (II. 311, V. 662, VII. 77). In Book 8, after the Cacus episode, Volcanus appears as a benefactor of Aeneas. In Books 9-12, one of five usages of "Volcanus" or "Volcanius" has the meaning of flame which is used in a simile for the winning fight of Pallas (X. 408), and three of the other four (IX. 148 f., XI. 439 ff., XII. 739 ff.) are for the description of Aeneas' arms which symbolize his final victory. In the remaining two cases, VII. 679 and X. 543, Volcanus is mentioned as the father of Caeculus, the legendary founder of Praeneste. We don't find any invention or innovation by Virgil in these passages or anything to do with the plot construction. We should interpret this drastic change of the meaning of Volcanus for the Trojans not only with the allegory of fire but also with that of war. War, like fire, is ambivalent and can represent destruction and slaughter on the one hand, as it was to the Trojans in Book 2, and, on the other, a fair and proper device to restore the peace and establish a state, as it was to the Trojans in Books 9-12. With the Cacus episode as a
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