Roots of the Cosmere

[Czanos]

You're pretty close, but the facts aren't quite right. Hoid appears in the Well of Ascension as an unnamed Terrisman, and  he is named once more in Hero of Ages by Cett, but this is the encounter where Vin's "instincts" tell her not to see him so she doesn't.

Hoid is also the beggar that Sarene hires to deliver goods to Elantris in Elantris.