Which preposition to use with decury

of Occurrences 2%

The decury of centurions, says he.

as Occurrences 1%

[Footnote 17: Two interpretations are given of this passage(1) that out of each decury one senator was chosen by lot to make up the governing body of ten; (2) that each decury as a whole held office in succession, so that one decury was in power for fifty days.]

Which preposition to use with  decury