Valenty Slivicki ( 1765 - 1857 ) was a painter. Valenty Slivicki s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 543.61 USD for A gentleman, in profile to left, in blue coat with light blue facings and collar, lace cravat, powdered wig en queue in 2007 to 5738.1 USD for Count Aleksandr Matveevich Dmitriev-Mamonov (1758-1803), in