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Ardices of Corinth and Telephanes of Sicyon, were, according to Pliny (xxxv. 5), the first artists who practised the monogram, or drawing in outline with an indication also of the parts within the external outline, but without colour, as in the designs of Flaxman and Retzsch. Pliny, after stating that the invention of the earliest form of drawing, namely, the external outline, as marked by the edge of the shadow (umbra Jiominis lineis circumducta, or pictura linearis), was claimed by the Egyptians, the Corinthians, and the Sicyonians, adds, that it was said to have been invented by Philocles, an Egyptian, or by Cleanthes, a Corinthian, and that the next step was made by Ardices and Telephanes, who first added the inner lines of the figure (spargentes tineas intus)

Stelios Lydakis, Ancient Greek Painting and Its Echoes in Later Art Publisher: Getty Publishing ISBN: 0892366834