Tipos de cartas

-:- res privatæ -:-

-:- ex officio -:-

(written by some person acting in an official capacity, like safe-conducts, notifications, injunctions, etc.)

Arquivo Nacional Torre do Tombo - Correspondência de soberanos.

-:- ex labore -:-

(written by a professional, concerning matters of his art, science or expertise)

-:- ex negotio -:-

(business correspondence)

-:- ex opere operato -:-

(epistolary acts: testaments, letters of credence, war declarations, etc.)