Trissum is marked on Ptolemy's 9th map in his Geography.
Trissúm (Ancient Greek: Τρισσόν[1]) was an ancient city mentioned by Ptolemy. It was located between the Middle Danube and the Tisza River, in what was considered the territory of Metanasian Iazyges.[2][3][4]
↑Claudius Ptolemy. The Geography. Translated and edited by Edward Luther Stevenson, Dover Publications, INC, New York, 1991, p. 81
↑Klaudios Ptolemaios. Handbuch der Geographie. Griechisch-Deutsch. Herausgegeben von Alfred Stückelberger und Gerd Graßhoff. Schwabe Verlag Basel. 2006, p. 310-311
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