Matthew 8:5

ἑκατόνταρχος, i.e. a captain or commander of a century—a company nominally composed of a hundred men, the sixtieth part of a legion in the Roman army. This centurion was probably an officer in the army of Herod Antipas, which would be modelled after the Roman fashion, and not, as is often understood, a Roman Centurion.

This form appears to be used indifferently with the form in -ης which the best criticism has restored in Matthew 8:13.