Trachonitis
(a rugged region), Lu 3:1 is in all probability the Greek equivalent for the Aramaic Argob, one of the five Roman provinces into which the country northeast of the Jordan was divided in New Testament times. [ARGOB]
Bibliography Information Smith, William, Dr "Definition for 'Trachonitis' Smiths Bible Dictionary". bible-history.com - Smiths; 1901.