The familiar version of Joshua Norton's San Francisco immigration story — a narrative developed primarily between 1879 and 1939 by that period's leading writers about Emperor Norton — holds that the future Emperor made his way from Cape Town to Rio de Janeiro, where he booked passage on the Hamburg ship Franzeska and arrived in San Francisco on 23 November 1849.

The "story of the story" — of how this narrative came together and was canonized — is interesting on its own. What has yet to surface, however, is any primary-source documentation verifying Joshua's passage on any particular ship or his arrival in San Francisco in November 1849.

Absent such evidence, what we really have in the "received version" of this story — as with a number of details about the Emperor's pre-imperial life, in particular — is more a work of "collaborative intuition," a theory in search of documentation.

This is the first in an occasional series of articles on aspects of the Emperor Norton biography that should be regarded as "open questions" — and opportunities for research.