MATTIACUM(Ματτιακόν), a town in the north of the country of the Mattiaci. (Ptol. 2.11.29.) Some writers believe this town to be the same as the Mattium mentioned by Tacitus (Tac. Ann. 1.56), as the capital of the Chatti, which was set on fire in A.D. 15, during the war of Germanicus. But a careful examination of the passage in Tacitus shows that this cannot be; and that Mattiacum is probably the modern town of Marburgon the Lahn(Logana), whereas Mattium is the modern Maden, on the right bank of the Eder (Adrana). (Comp. Wilhelm, Germanien, p. 188.) [L. S.