The Count of the Stable (Latin: comes stabuli; Greek: κόμης τοῦ σταύλου/στάβλου, translit. komes tou staulou/stablou) was a late Roman and Byzantine office responsible for the horses and pack animals intended for use by the army and the imperial court.[1] From Byzantium, it was adopted by the Franks, and is the origin of the post and title of constable, via the Old French conestable.[2][3]
ODB
was invoked but never defined (see the help page).