Angelo and Raffaelle
Michael Angelo criticised Raffaelle very severely.
Such was the language of this false Italian [Angelo]: One time he christened Raphael a Pygmalion, Swore that his maidens were composed of stone: Swore his expressions were like owls, so tame, His drawings, like the lamest cripple, lame; And as for composition, he had none.
(See Michael Angelo.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894