800-840 AD., Byzantine lead seal, Nikephoros, Basilikos Primikerios, unlisted.

Byzantine lead seal, Nikephoros, basilikos Primikerios (tu Kubukliu), ca. 800-840 AD.,
lead seal (26-31 mm / 18,07 g),
Obv.: ΘEOTOKE BOHΘEI , Theotoke boethei , ( = 'Godbearer, aid ...' ), in a cruciform monogram, in 4 fields: TW - CW / Δ{OY} - ΛW , to co doulou , ... your servant.
Rev.: + NIKH[H] / ΦOPW B´ / [Π]PIMHK / HPIW (Nikephoros (the) imperatorial Primikerios (of the bed-chamber) ).
unlisted .

The term primicerius or prim(m)ikērios (Greek: πριμ(μ)ικήριος) was a title applied in the later Roman Empire and the Byzantine Empire to the heads of administrative departments, and also used by the Church to denote the heads of various colleges. Etymologically the term derives from primus in cera, which is to say in tabula cerata, the first in a list on a waxed tablet of a class of officials.
From their origin in the court of the Dominate, there were several primicerii (primikērioi in Greek, from the 12th century usually spelled primmikērioi). In the court, there was the primicerius sacri cubiculi (in Byzantine times the primikērios of the kouboukleion), in charge of the emperor's bedchamber, almost always an eunuch.

Im Taktikon Uspenskij (842-843) steht der Primikerios tu Kubukliu noch über dem Genikos Logothetes und den Protospatharioi eunuchoi (51, 20-23).