rubrician

ru·bri·cian

 (ro͞o-brĭsh′ən)
n. Ecclesiastical
A person learned in the rubrics of ritual.

rubrician

(ruːˈbrɪʃən)
n
(Ecclesiastical Terms) an authority on liturgical rubrics

ru•bri•cian

(ruˈbrɪʃ ən)

n.
an expert in or close adherent to liturgical rubrics.
[1840–50]