Latin

Boyd’s Bible Dictionary:

Language of Latium, that is, the Romans
(Luke 23:38; John 19:20).

Concise Bible Dictionary:

The language of the Romans. In scripture it is only mentioned as being one of the tongues in which Pilate wrote the inscription on the cross of the Lord Jesus (Luke 23:38; John 19:20). A number of words in the Greek of the New Testament are borrowed from the Latin. Such are σπεκουλάτωρ, “an executioner,” Lat. speculator; σοωδάριον, “a napkin,” Lat. sudarium.

Jackson’s Dictionary of Scripture Proper Names:

of Rome’s strength