Joao Ribeiro ( 1955 - ) is a Portuguese painter. Joao Ribeiro s works have been put up for auction numerous times, with realized prices varying from 73.77 USD for Retrato do 1º Marquês de Chaves e 2º Conde de Amarante in 2015 to 538.02 USD for Sem título in 2015 , based on the size and medium of the artwork.