Letterlocking: Mary Queen of Scots’ last letter, a spiral lock, England (1587) (UH0135)
Why the open web links it
Reveals the intricate spiral lock technique used in Mary Queen of Scots' 1587 letter, showcasing historical document security methods.
Linked by 6 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including kcl.ac.uk, openculture.com, glasgow.ac.uk, abc-web.be, haagsehandschriften.nl.