Quiz appears in print in the 1780s, an odd person, with the verb to quiz, to mock or interrogate, following. The Daly wager story surfaces in an 1835 memoir, over forty years late, with no contemporary evidence, and the OED marks the origin uncertain.
The Daly story is irresistible and endlessly retold, sometimes with the bet placed at Dublin Castle, sometimes with chimney sweeps hired to chalk the walls. Every detail varies by retelling, which is exactly how you know it is a legend doing legend work.
The archivist's observation: quiz may be the only common word whose origin is officially a shrug, and the shrug is celebrated rather than hidden. The wall-chalking myth persists because it is about virality, invented by people who had never seen a wall post go viral, proving the concept transcends the medium.
The word for testing knowledge has an untestable origin. Is there a better monument to this archive's whole premise?