Mara bar Serapion

Test each clause of the letter against each candidate.

"Executing their wise king." The letter's structure is a triplet of peoples destroying their own sage – Athenians/Socrates, Samians/Pythagoras, Jews/wise king – and paying for it. Bar Kokhba was not executed by the Jews: he died at the hands of the Romans in the fall of Betar (135 CE), commanding the last Jewish army, as the Jews' own war leader. Making him the third panel of the triptych destroys the letter's entire rhetorical point, which requires the people to kill their own wise man. Jesus – executed in Jerusalem, in a tradition that from the earliest sources involved the Judaean leadership's instigation (Josephus's neutral core: "at the suggestion of the principal men amongst us"; 1 Thess 2:15; the gospel narratives) – fits the panel; Bar Kokhba is its exact inversion.

"Wise." Mara's exemplars are philosopher-teachers whose wisdom outlived them. Jesus enters the second century's common knowledge as precisely that – a teacher with a surviving movement (Pliny, Tacitus, Lucian's "crucified sophist"). Bar Kokhba's ancient reputation, in both Jewish and Christian memory, is a warlord and failed messiah – the rabbinic tradition renames him bar Koziba, "son of the lie," and remembers him executing Rabbi Eleazar on suspicion; nobody in antiquity calls him wise, and the one thing everyone remembers about him is warfare, not teaching.

"Not dead, because of the new laws he laid down." The parallel is Socrates living on through Plato and Pythagoras through his cult-statue: the sage survives in his legacy. Jesus's "new law" surviving through a growing movement was a commonplace by the second century (the Didache's very title is "the Teaching"; Justin☦ and the apologists call the gospel the new law). Bar Kokhba's administrative decrees – the real documents survive in the Judaean desert papyri, and they are lease agreements and requisition orders – died at Betar with his state; there was no "new law of Bar Kokhba" living on for Mara to gesture at, and his memory was actively repudiated by the rabbis. On this clause the identification is not merely weaker; it is empty.

"Just after that their kingdom was abolished." This is the page's best point against itself: the Jews had no kingdom in 30 CE, runs the implicit objection, so the punishment fits 135 better. But Mara is compressing at the same resolution in all three panels – the Athenian famine and the Samian sand are equally loose folklore, and "kingdom" (Syriac malkuthon) reads naturally as their polity/national existence, destroyed in 70 within the generation of the execution. A Syrian Stoic moralising at forty years' remove is exactly as precise as a Syrian Stoic moralising at zero years' remove would be – which is to say, not very, in all three exempla. (And if the letter's dramatic setting is genuine – the author writes as a captive of a Roman clearance of Samosata, which fits the Commagene annexation of 72/73 – then it predates Bar Kokhba by sixty years and the identification is impossible outright. The early dating has serious defenders in the specialist literature.)

Two candidates: one is a teacher, killed at his own people's instigation, whose "new law" conspicuously survived, a generation before a national catastrophe – matching all four clauses; the other is a general, killed by Romans, remembered as a false messiah, whose decrees died with him. The identification exists to avoid the obvious, and no peer-reviewed treatment of the letter adopts it.