The Collaborative International Dictionary of English v.0.48:

Tabellion \Ta*bel"lion\, n. [L. tabellio, fr. tabella a tablet,
   a writing, document, dim. of tabula a board: cf. F.
   tabellion. See Table.]
   A secretary or notary under the Roman empire; also, a similar
   officer in France during the old monarchy.
   [1913 Webster]