An expanding and powerful social category during the Russo-Turkish wars (which affected the Principalities' soil), many sudiţi were wholesale businessmen who formed guilds (bresle or isnafuri) and successfully competed with Romanians in several fields (after the Treaty of Adrianople in 1829 allowed the two countries to engage in foreign trade), expanding during the period of Russian administration (1828-1857).
Paul Cernovodeanu, "Evreii în epoca fanariotă", in Magazin Istoric, March 1997, p.25-28
Neagu Djuvara, Între Orient şi Occident. Ţările române la începutul epocii moderne, Humanitas, Bucharest, 1995, p.184-187
Constantin C. Giurescu, Istoria Bucureştilor. Din cele mai vechi timpuri pînă în zilele noastre, Ed. Pentru Literatură, Bucharest, 1966, p.114, 115, 288