The Silva Arsia is a forest or wooded area near Rome situated where the Roman and Veientine territories abutted.Dionysius of Halicarnassus 5.14-17 mentions in this context the sacred grove of a hero Horatus; in their notes on Livy 2.7.2, Charles Anthon and Hugh Craig minimized its extent as a forest: "It was probably nothing more than a sacred grove." (Anthon and Craig, eds.Titi Livi Ab Urbe Condita: libri I, II, XXI et XXII (New York, 1884:412);. Legend has it that in 509 BCE the Romans heard the prophetic voice of Silvanus foretelling their victory over the Etruscans (Livy), 2.7.2). At the Battle of Silva Arsia that year the forces said to have been assembled by the Etruscan Tarquin"Though the battle of the Silva Arsia is mentioned so often as to deserve some credence, the part played by Tarquinii in the campaign cannot be treated seriously in the absence of evidence that its introduction is due to more than", Cambridge Ancient History 7 (1954:396). were defeated, though with the loss of the Roman consul Lucius Junius Brutus.Livy, Ab urbe condita, 2.6-7 The forest, rich in timber essential for shipbuilding, had been seized from the Etruscans of Veii by Ancus Martius.Guglielmo Ferrero, Corrado Barbagallo, A Short History of Rome vol. 1 (1905:47).
Since woodland was everywhere the province of Silvanus, there is no reason to connect the otherwise unknown Silva Arsia with the "forest of Silvanus [Silvanus luccus] outside the walls at a distance, all overgrown with a willow grove" noted in Plautus' Aulularia 674.Yves Bonnefoy, Wendy Doniger, Roman and European Mythologies, s.v. "Silvanus".
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