(Τισαγόρας), an artist who wrought in iron, and dedicated at Delphi a group made by himself in that material, representing the contest of Hercules with the hydra. Pausanias mentions this group as an admirable specimen of that most difficult kind of statuary in metal, but as to who Tisagoras was, he confesses himself entirely ignorant. (Paus. 10.18.5. s. 6.)
[P.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890