Louis Braille and Charles Barbier did not meet until 1833 — four years after Braille had already published his own compressed six-dot cell (1829)

The conventional Braille origin story compresses two events into a single scene: a soldier or inventor demonstrates raised-dot night writing to blind students, and the young Louis Braille improves it on the spot into the modern cell. Philippa Campsie's account, drawn from Barbier's papers and correspondence, separates them. Braille had already published his own six-dot system in 1829 — the compression of Barbier's larger 2×6 (twelve-dot) phonetic grid down to the 2×3 cell still used today. Braille and Barbier did not actually meet in person until 1833, four years after that publication.

The revised chronology undercuts the "young prodigy improves on a visiting demonstration" narrative: Braille's decisive innovation preceded any personal contact with Barbier. Campsie further describes their later correspondence as "invariably friendly," which contradicts a separate legend — traced to school director Alexandre-René Pignier — of a personal rivalry between the two men. That legend is now dated and detailed at claim-pignier-fabricated-braille-barbier-hostile-encounter-in-retirement-memoir.

This is the neighboring fact to the myth-correction recorded at claim-barbier-night-writing-designed-for-blind-not-soldiers; the third fact from the same source, on Barbier's intended audience, is claim-barbier-universal-phonetic-literacy-ambition. The pattern of a narrative-shaped historical record hardening ahead of the archival evidence is the vault's recurring "priority and myth" theme — cf. claim-lamport-paxos-greek-allegory-delayed-publication.