A picture by him representing the birth of the goddess Minerva was seen in the temple of Diana near the Alpheius River. This work was not, as the archaeologist Friedrich Wilhelm Eduard Gerhard once said, in a "ludicrous style", but rather in the severe style of ancient art. Modern scholars now believe Gerhard to be conflating Cleanthes with the artist Ctesilochus.
This article incorporates text from a publication now in the public domain: Urlichs, Ludwig (1870). "Cleanthes". In Smith, William (ed.). Dictionary of Greek and Roman Biography and Mythology. 1. p. 779.