prīmĭcērĭus (noun M) : primus - cera; whose name stands first on the wax-coated tablets; hence
* The first among those holding a similar office, a chief, head, superintendent (post-class.): primicerius in officio Praefectorum Praetorio,Veg. Mil. 2, 21: protectorum,of the guard,Amm. 18, 3, 5: notariorum, the chancellor or chief of the secretaries, Cod. Th. 11, 18, 1: sacri cubiculi,the head-chamberlain,Cod. Just. 12, 28, 1 et saep.

s. TLL