Gabrielle Rainer Istvanffy ( 1877 - 1964 ) was a Hungarian painter. Gabrielle Rainer Istvanffy s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 231.54 USD for two white cats in 2015 to 2124.24 USD for Gute Freunde in 2015 , based on the size and medium of the artwork.