[1] : The Collaborative International Dictionary of English v.0.48

datary \da"tary\, n. ll. datarius. see dataria.
   1. r. c. ch. an officer in the pope's court, having charge
      of the dataria.
      1913 webster

   2. the office or employment of a datary.
      1913 webster
see also:
dataria 

[2] : THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993)

datary, n.  a high ecclesiastic official of the roman catholic church,
whose important function is to brand the pope's bulls with the words
_datum romae_.  he enjoys a princely revenue and the friendship of
god.

Datary >> D Words
Datary, definition of term: Datary
datary_pag1.html