How the Sages Planted Dreams Into Two Pagan Kings

Two short stories preserved in The Exempla of the Rabbis, Moses Gaster's 1924 anthology, record a striking rabbinic capacity. Two famous sages, in two different empires, planted specific dreams into the heads of two reigning pagan kings.

The first is Samuel the Babylonian Amora, who told King Sabur of Persia what he would dream that night. The second is R. Joshua ben Hananya, who told the Roman emperor what he would dream that night. Both kings dreamed exactly what the sages had told them they would.

Samuel and King Sabur

Exempla 218 records the Sabur exchange. The Persian king asks Samuel what he would dream about that night. Samuel, the leading Babylonian rabbinic authority of his generation, answers directly. You will see the Romans coming.

The exemplum closes the first half of the story with a single sentence. And he saw it in his dream. The king's nightmare arrived as predicted. Samuel had, in this reading, placed a specific dream-content into the king's sleeping mind by stating it aloud during the king's waking hours.

The teaching about how this worked is implicit. The exemplum does not claim Samuel had supernatural control over the king's dreams. The mechanism, in the rabbinic understanding the exemplum preserves, is psychological. A statement attributed to a known sage, made to a powerful man's face during the day, will follow that man into sleep. The dream that follows is the day's preoccupation surfacing in the night.

R. Joshua ben Hananya and the Roman Emperor

The exemplum then records the parallel scene. The Roman Caesar asks R. Joshua ben Hananya the same question. The Rabbi answers in the mirror image. You will dream that the Persians are coming upon you.

The exemplum closes the second half with a similar single sentence. The emperor thought of the prediction all day. He dreamed of it at night. The same mechanism Samuel had used in Persia, R. Joshua had used in Rome.

The pairing is the point. Two different rabbis, working in two different empires, demonstrated the same capacity to plant specific dream-content into specific pagan kings. The exemplum is preserving a tradition that Jewish sages, by the precision of their speech to powerful men during the day, could shape what those powerful men experienced at night.

The Mechanism the Exempla Was Preserving

Exempla 218 (alternate) is the citation index for the same pair of stories. The Talmudic source is Berakhot 56a, where the longer versions of both encounters are preserved. The Midrash HaGadol on Genesis and the Yalkut Shimoni also carry the tradition.

The citation index matters. The medieval Jewish reader, encountering the Exempla's compressed version, could find the longer version in the Talmud. The tradition was not unique to Gaster. It had been transmitted across multiple major collections because the principle the tradition preserves is durable. Jewish speech to non-Jewish power, when precisely calibrated, can shape what that power dreams.

The teaching has political weight. Samuel and R. Joshua were not, in these stories, deploying mystical apparatus. They were demonstrating a particular kind of rabbinic articulacy. The articulacy reached into the king's mind during the day, and the king's subconscious reproduced the articulacy at night. The dreams that followed were not magic. They were the natural consequence of careful sage-to-king speech.

Why Jewish Memory Kept These Two Together

Read the two passages together and the editorial design of Gaster's Exempla becomes legible. The collection preserves both the Sabur and the Roman exchange because the pair demonstrates the same principle operating in two empires.

The Jewish community living under either Sasanian or Roman rule could find, in these tales, the model for how rabbinic speech to imperial power was supposed to work. The model was not flattery. It was not capitulation. It was a calibrated articulacy that knew what would lodge in a king's mind and what would surface in the king's dreams. The Exempla preserves both versions because the political environment kept requiring the model in successive centuries.