Bible Dictionaries
Quaternion

Easton's Bible Dictionary

A band of four soldiers. Peter was committed by Herod to the custody of four quaternions, i.e., one quaternion for each watch of the night (Acts 12:4 ). Thus every precaution was taken against his escape from prison. Two of each quaternion were in turn stationed at the door (12:6), and to two the apostle was chained according to Roman custom.

Bibliography Information
Easton, Matthew George. Entry for 'Quaternion'. Easton's Bible Dictionary. https://www.studylight.org/​dictionaries/​eng/​ebd/​q/quaternion.html. 1897.