James George Frazer,
The Golden Bough: A Study in Magic and Religion…
“ This implies that King Ancus Marcius, as well as Tarquin the Elder and Servius Tullius, perished by the hand of an assassin. No other ancient historian, so far as I know, records this of Ancus Marcius, though one of them says that the king “was carried off by an untimely death.” [1037] Tarquin the Elder was slain by two murderers whom the sons of his predecessor, Ancus Marcius, had hired to do the deed. [1038] Lastly, Servius Tullius came by his end in circumstances which recall the combat for the priesthood of Diana at Nemi. ”
