For instance, he once imprisoned the painter Agatharchus in his house until he had adorned it with paintings for him, and then dismissed his captive with a handsome present.
Edition :
Plutarch Lives IV: Alcibiades and Coriolanus, Lysander and Sulla, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 80), Harvard University Press: Cambridge/MA - London 2000 (first ed. 1916).