Fear looks for someone to blame
The plague was terrifying partly because it was incomprehensible. People saw neighbors die within days, and no remedy worked. In that atmosphere, rumors thrived, and communities sought explanations that suggested someone could be held responsible. The result, in several regions, was persecution, and the most serious and best documented of it was directed against Jews.
It is important to be plain about the facts: the accusations were false. Jews did not cause the plague, and Jewish communities suffered from the disease like everyone else. The violence was the result of prejudice, fear and, in some cases, local economic and political motives.
The well-poisoning accusation
The central charge was that Jews had spread the plague by poisoning wells, springs or food. The rumor appears in the south of France and the Alpine region in 1348. In fall of that year, at Chillon on Lake Geneva, a number of Jews were arrested and, under judicial torture, confessed to poisoning. Confessions obtained this way are unreliable, but the written results were circulated and used to justify the rumor elsewhere.
The accusation drew on older hostility. Medieval Europe already had a tradition of baseless claims against Jews, including the blood libel, and Jewish communities lived with legal restrictions and recurring hostility. Their position as a religious minority, and in some places as moneylenders to whom many people were in debt, made them a convenient target. The role of Jewish moneylending in resentment is real, but it should not be taken as an explanation that justifies violence.
Massacres of 1348 to 1351
From early 1349 the violence escalated in the German lands and neighboring regions. Basel, Freiburg and other towns along the Rhine saw Jews arrested, expelled or burned. At Strasbourg, in February 1349, a large number of Jews were killed, a massacre that is among the best known and is often cited as one of the worst of the episode. Mainz, Cologne and numerous smaller towns followed later in the year. Across the Empire, entire communities were destroyed in the span of months. In some areas, the attacks occurred before the plague had even arrived, driven by fear of its approach.
Exact casualty numbers are uncertain, and chronicles give round figures. What is clear is that many communities that had existed for generations were wiped out or driven out, and survivors often fled eastward, notably into Poland, where rulers offered some protection, though the details of this migration are debated.
Who else was blamed
Jews were the main target, but not the only one. In various places suspicion fell on lepers, beggars, strangers, pilgrims and foreigners. Rumors of poisoners and plotters traveled quickly along the same roads as the disease. Women suspected of witchcraft were not yet widely persecuted on the scale of later centuries, so this period should not be confused with the witch trials that came much later.
How authorities responded
The response was mixed, and it matters not to describe it as uniformly bad or uniformly good.
The papacy. Pope Clement VI, at Avignon, issued statements in 1348 condemning the accusations. He pointed out that the plague also struck places where no Jews lived, and he threatened church penalties against those who killed Jews without legal judgment. He also stressed that Jews were dying of the disease too. These bulls were important but were often ignored by local mobs and by city councils.
Town councils and rulers. Their actions varied widely. Some councils tried to protect their Jewish residents, for reasons ranging from principle to financial interest, since Jewish communities paid taxes to the crown or the city. In Strasbourg, the ruling council that had resisted the violence was reportedly removed in the same period, and the killings followed. In other towns, councils themselves ordered arrests or expulsions. The debts owed to Jewish lenders, and the property left behind, sometimes gave local people a financial reason to cooperate with violence.
The Church more broadly. Clergy were divided. Some preached against the violence; others fueled fear. The Church of the period tolerated Jews in theory under protective doctrine but also taught hostility toward them, and the medieval church could not fully control popular passions.
Communities and the wider response
Persecution was one reaction among several. In other places, communities dealt with fear through penance, processions and, in some regions, flagellants. These movements were occasionally connected to anti-Jewish violence, though not always. Ordinary people also helped or sheltered neighbors, and some towns resisted the pressure to act.
Aftermath
In many German towns, Jews later returned or were readmitted, sometimes within a few years, often with new restrictions and conditions. In others, communities did not recover. The events left a lasting mark on Jewish life in Europe and illustrate how crisis can turn existing prejudice into deadly violence.
Reading the sources
Sources include chronicles by townspeople, official letters, trial records and Jewish accounts. Each has a bias, and numbers differ. Historians do not doubt the broad pattern of the persecution, but they approach each local case carefully, aware that figures and motives are often unclear.