Balavignus is a bit of a footnote in the history of the Plague, and not many have written about him. However, there is a long quotation about him in "The Black Death in the 14th Century" by I.F.C. Hecker, which is available on Project Guttenberg. This is the quotation (its a long one) from page 183:
"The Confession made on the 15th day of September, in the year of our Lord 1348, in the Castle of Chillon, by the Jews arrested in Neustadt, on the Charge of Poisoning the Wells, Springs and other places; also Food &c., with the Design of destroying and extirpating all Christians.
I. Balavignus, a Jewish physician, inhabitant of Thonon, was arrested at Chillon in consequence of being found in the neighbourhood. He was put for a short time to the rack, and, on being taken down, confessed, after much hesitation, that, about ten weeks before, the Rabbi Jacob of Toledo, who because of a citation, had resided at Chamberi since Easter, sent him, by a Jewish boy, some poison in the mummy of an egg: it was a powder sewed up in a thin leathern pouch accompanied by a letter, commanding him, on penalty of excommunication, and by his required obedience to the law, to throw this poison into the larger and more frequented wells of the town of Thonon, to poison those who drew water there. He was further enjoined not to communicate the circumstance to any person whatever, under the same penalty. In conformity with this command of the Jewish rabbis and doctors of the law, he, Balavignus, distributed the poison in several places, and acknowledged having one evening placed a certain portion under a stone in a spring on the shore at Thonon. He further confessed that the said boy brought various letters of a similar import, addressed to others of his nation, and particularly specified some directed severally to Mossoiet, Banditon, and Samoleto of Neustadt; to Musseo Abramo and Aquetus of Montreantz, Jews residing at Thurn in Vivey; to Benetonus and his son at St. Moritz; to Vivianus Jacobus, Aquetus and Sonetus, Jews at Aquani. Several letters of a like nature were sent to Abram and Musset, Jews at Moncheoli; and the boy told him that he had taken many others to different and distant places, but he did not recollect to whom they were addressed. Balavignus further confessed that, after having put the poison into the spring at Thonon, he had positively forbidden his wife and children to drink the water, but had not thought fit to assign a reason. He avowed the truth of this statement, and, in the presence of several credible witnesses, swore by his Law, and the Five Books of Moses to every item of his deposition.
On the day following, Balavignus, voluntarily and without torture, ratified the above confession verbatim before many persons of character, and, of his own accord, acknowledged that, on returning one day from Tour near Vivey, he had thrown into a well below Mustruez, namely that of La Conerayde, a quantity of the poison tied up in a rag, given to him for the purpose by Aquetus of Montreantz, an inhabitant of the said Tour: that he had acquainted Manssiono, and his son Delosaz, residents of Neustadt, with the circumstance of his having done so, and advertised them not to drink of the water. He described the colour of the poison as being red and black.
On the nineteenth day of September, the above-named Balavignus confessed, without torture, that about three weeks after Whitsuntide, a Jew named Mussus told him that he had thrown poison into the well in the custom-house of that place, the property of the Borneller family; and that he no longer drank the water of this well, but that of the lake. He further deposed that Mussus informed him that he had also laid some of the poison under the stones in the custom-house at Chillon. Search was accordingly made in this well, and the poison found: some of it was given to a Jew by way of trial, and he died in consequence. He also stated that the rabbis had ordered him and other Jews to refrain from drinking of the water for nine days after the poison was infused into it; and, immediately on having poisoned the waters, he communicated the circumstance to the other Jews. He, Balavignus, confessed that about two months previously, being at Evian, he had some conversation on the subject with a Jew called Jacob, and, among other things, asked him whether he also had received writings and poison, and was answered in the affirmative; he then questioned him whether he had obeyed the command, and Jacob replied that he had not, but had given the poison to Savetus, a Jew, who had thrown it into the Well de Morer at Evian. Jacob also desired him, Balavignus, to execute the command imposed on him with due caution. He confessed that Aquetus of Montreantz had informed him that he had thrown some of the poison into the well above Tour, the water of which he sometimes drank. He confessed that Samolet had told him that he had laid the poison which he had received in a well, which, however, he refused to name to him. Balavignus, as a physician, further deposed that a person infected by such poison coming in contact with another while in a state of perspiration, infection would be the almost inevitable result; as might also happen from the breath of an infected person. This fact he believed to be correct, and was confirmed in his opinion by the attestation of many experienced physicians. He also declared that none of his community could exculpate themselves from this accusation, as the plot was communicated to all; and that all were guilty of the above charges. Balavignus was conveyed over the lake from Chillon to Clarens, to point out the well into which he confessed having thrown the powder. On landing, he was conducted to the spot; and, having seen the well, acknowledged that to be the place, saying, “This is the well into which I put the poison.” The well was examined in his presence, and the linen cloth in which the poison had been wrapped was found in the waste-pipe by a notary-public named Heinrich Gerhard, in the presence of many persons, and was shewn to the said Jew. He acknowledged this to be the linen which had contained the poison, which he described as being of two colours, red and black, but said that he had thrown it into the open well. The linen cloth was taken away and is preserved.
Balavignus, in conclusion, attests the truth of all and every thing as above related. He believes this poison to contain a portion of the basilisk, because he had heard, and felt assured, that the above poison could not be prepared without it."
