Persecution of Jews during the Black Death
The persecution of Jews during the Black Death consisted of a series of violent mass attacks and massacres. Jewish communities were often blamed for outbreaks of the Black Death in Europe. From 1348-1351, acts of violence were committed in Toulon, Barcelona, Erfurt, Basel, Frankfurt, Strasbourg and elsewhere. The persecutions led to a large migration of Jews to Jagiellonian Poland and the Grand Duchy of Lithuania. There are very few Jewish sources on Jewish massacres during the Plague.

Background 

The official policy of the Church, which was reasoned in part because Jesus was Jewish, was to protect Jews. In practice, however, Jews were frequently the targets of Christian loathing. As the plague swept across Europe in the mid-14th century and annihilated nearly half the population, people had little scientific understanding of disease and were looking for an explanation.

Jews were frequently used as scapegoats and false accusations which stated that they had caused the disease by deliberately poisoning wells were circulated. That is likely because they were less affected than the other people 
since many Jews chose not to use the common wells which were located in towns and cities. Additionally, Jews were sometimes coerced to confess to poisoning wells through torture.

Persecutions and massacres
The first massacre directly related to the plague took place in April 1348 in Toulon, where the Jewish quarter was sacked, and forty Jews were murdered in their homes. Shortly afterward, violence broke out in Barcelona and other Catalan cities. In 1349, massacres and persecutions spread across Europe, including the Erfurt massacre, the Zürich massacre, the Basel massacre, and massacres in Aragon , Fulda and Flanders. Around 2,000 Jews were burnt alive on 14 February 1349 in the "Valentine's Day" Strasbourg massacre, where the plague had not yet affected the city. While the ashes smouldered, Christian residents of Strasbourg sifted through and collected the valuable possessions of Jews that were not burnt by the fires. The following September, 330 Jews were burned alive in the Kyburg Castle, east of Zürich. Many hundreds of Jewish communities were destroyed in this period. Within the 510 Jewish communities destroyed in this period, some members killed themselves to avoid the persecutions. In the spring of 1349, the Jewish community in Frankfurt am Main was annihilated. That was followed by the destruction of Jewish communities in Mainz and Cologne. The 3,000-strong Jewish population of Mainz initially defended themselves and managed to hold off the Christian attackers. However, the Christians managed to overwhelm the Jewish ghetto in the end and killed all of its Jews.

At Speyer, Jewish corpses were disposed in wine casks and cast into the Rhine. By late 1349, the worst of the pogroms had ended in Rhineland. However, the massacres of Jews was starting to rise near the Hansa townships of the Baltic coast and in Eastern Europe. By 1351, there had been 350 incidents of anti-Jewish pogroms, and 60 major and 150 minor Jewish communities had been exterminated.

Causes 
There are many possible reasons why Jews were accused to be the cause of the plague. Anti-Semitism was widespread in the 14th century, and in some locales, the plague was stated to be the work of Jews as retribution for the dying's wicked ways. Harbouring "enemies of Christ" was also given as a reason. Some commentators have argued that Jews who were not killed actually stood a better chance of surviving the plague because of greater cleanliness, sanitation and observance of the laws of kashrut. David Nirenberg, dean of the University of Chicago Divinity School and a specialist in medieval Jewish history, doubted whether there is credible evidence for that assertion. Another reason to discount that theory is that the plague was spread by flea bites, which would have been unaffected by handwashing. Communities that valued the work of Jews in the city more saw less persecution, and those that did not value it saw more.

Responses of governments 
In many cities, the civil authorities either did little to protect the Jewish communities or they actually abetted the rioters.

The attacks led to the eastward movement of Northern European Jewry to Poland and Lithuania, where they remained for the six centuries. King Casimir III of Poland enthusiastically gave refuge and protection to the Jews. That is consistent with his previous edicts toward Jews. On 9 October 1334, Casimir had confirmed the privileges granted to Jews in 1264 by Bolesław V the Chaste. Under penalty of death, he prohibited the kidnapping of Jewish children for the purpose of enforced Christian baptism, and he inflicted heavy punishment for the desecration of Jewish cemeteries. The king was therefore already well-disposed to Jews. He was also interested in tapping the economic potential of the Jews.

Church's view
Pope Clement VI (the French-born Benedictine, whose birth name was Pierre Roger) tried to protect the Jewish communities by issuing two papal bulls in 1348, on 6 July and 26 September. They stated that those who blamed the plague on the Jews had been "seduced by that liar, the Devil". He went on to emphasize, "It cannot be true that the Jews, by such a heinous crime, are the cause or occasion of the plague, because through many parts of the world the same plague, by the hidden judgment of God, has afflicted and afflicts the Jews themselves and many other races who have never lived alongside them". He urged clergy to take action to protect Jews and offered them papal protection in the city of Avignon. Clement was aided by the research of his personal physician, Guy de Chauliac, who argued from his own treatment of the infected that the Jews were not to blame.

Clement's efforts were in part undone by the newly-elected Charles IV, Holy Roman Emperor, who made property of Jews killed in riots forfeit and gave local authorities a financial incentive to turn a blind eye.

The influence of Clement VI and of the Church over much of Western Europe proved limited and so many of their attempts to protect Jews were futile. However, this was not the case in regions in which the Pope had considerably more influence; for example, in Avignon, the Pope saved many Jewish lives.

Aftermath
As the plague waned in 1350, so did the violence against Jewish communities. In 1351, the plague and the heightened persecution was over, though the background level of persecution and discrimination remained. Ziegler (1998) comments that "there was nothing unique about the massacres." 20 years after the Black Death, the Brussels massacre (1370) wiped out the Belgian Jewish community. The Schaffhausen massacre in 1401, expulsion orders against the Jews in Zürich, and their definitive expulsion from the city in 1634 were contributing factors in mass migrations to eastern Europe. The final instance came after Eiron (Aaron) of Lengnau was accused and executed for blasphemy.

One of the most significant long-term consequences of the Black Death in Europe was the migration of Jews to Poland. Their migration to Poland was an attempt to escape from the persecution which they were being subjected to in Western Europe. This event is one of the major factors that contributed to the existence of a large population of Jews in Poland during the early 20th century. Approximately 3.5 million Jews lived in Poland at the time of Adolf Hitler's rise to power.

Jewish tales
Jewish accounts of the Black Death were told in Jewish tales for nearly 350 years, but there were no written accounts of the Black Death in Jewish tales until 1696, when accounts by Yiftah Yosef ben Naftali Hirts Segal Manzpach ("Juspa Schammes" for short) began to be circulated in the Mayse Nissim. Yuzpa Shammes, was a scribe and gabbai (warden of a synagogue) of the Worms community for several decades. His accounts intend to show that the Jews were not idle because they took action in order to prevent themselves from inevitably becoming scapegoats. Despite Yuzpa's assertion that the Jews fought back during the massacres, there are contradictory accounts, which claim that there was no evidence of "armed resistance".

See also
 Antisemitic trope
 History of antisemitism
 Timeline of antisemitism
 Expulsions and exoduses of Jews
 Persecution of Jews
 Pogrom
 Erfurt massacre (1349)
 Black Death in medieval culture
 Black Death in the Holy Roman Empire
 
 History of European Jews in the Middle Ages
 Medieval antisemitism

References

Further reading
 Winkler, Albert (2007). "The Approach of the Black Death in Switzerland and the Persecution of Jews, 1348–1349," Swiss American Historical Society Review, vol. 43 (2007), no. 3, pp. 4–23.
 Winkler, Albert (2005). "The Medieval Holocaust: The Approach of the Plague and the Destruction of Jews in Germany, 1348–1349," Federation of East European Family History Societies, vol. 13 (2005), pp. 6–24.

Black Death
Massacres in Germany
Jewish German history
Massacres in France
Jewish French history
Massacres in Spain
Jewish Spanish history
14th-century papal bulls
Conflicts in 1348
Conflicts in 1349
Medieval anti-Jewish pogroms
Persecution of Jews
Antisemitic attacks and incidents in Europe
Jewish Swiss history
History of Basel
History of Strasbourg
History of Europe
History of Brussels
Medieval Barcelona
Epidemic riots