I've managed to cull some 'different' items at the auctions for the next while ... a case in point is this interesting painting by Gregorio Lazzarini depicting Tiberius Gracchus killing a snake. Details

The story can be found in Plutarch's Lives, of course, in the intro to the Life of Tiberius:

Having completed the first two narratives, we now may proceed to take a view of misfortunes, not less remarkable, in the Roman couple, and with the lives of Agis and Cleomenes, compare these of Tiberius and Caius. They were the sons of Tiberius Gracchus, who, though he had been once censor, twice consul, and twice had triumphed, yet was more renowned and esteemed for his virtue than his honors. Upon this account, after the death of Scipio who overthrew Hannibal, he was thought worthy to match with his daughter Cornelia, though there had been no friendship or familiarity between Scipio and him, but rather the contrary. There is a story told, that he once found in his bedchamber a couple of snakes, and that the soothsayers, being consulted concerning the prodigy, advised, that he should neither kill them both nor let them both escape; adding, that if the male serpent was killed, Tiberius should die, and if the female, Cornelia. And that, therefore, Tiberius, who extremely loved his wife, and thought, besides, that it was much more his part, who was an old man, to die, than it was hers, who as yet was but a young woman, killed the male serpent, and let the female escape; and soon after himself died, leaving behind him twelve children borne to him by Cornelia.