Blucium or Bloukion (Ancient Greek: Βλούκιον) was a fortress of the Tolistoboii in ancient Galatia.[1] It was the residence of Deiotarus,[1] in defence of whom Cicero made an oration, addressed to the Dictator Caesar. In the text of Cicero, the name is read Luceium,[2] and, accordingly, some translators amend Strabo by writing Λούκειον.
Its site is located near Karalar, Asiatic Turkey.[3][4]