his private secretary and counselor Isaiah ben Joseph, who used his influence on behalf of the Jews. In 1573 Isaiah was dismissed, owing to court intrigues, but he was not harmed any further, and subsequently left for Moldavia (where he entered the service of Muscovy's Grand Prince Ivan the Terrible). Through the efforts of Solomon Ashkenazi, Aron Tiranul was placed on the throne of Moldavia; nevertheless, the new ruler persecuted and executed nineteen Jewish creditors in Iași, who were decapitated without process of law. At around the same time, in Wallachia, the violent repression of creditors peaked under Michael the Brave, who, after killing Turkish creditors in Bucharest (1594), probably engaged in violence against Jews settled south of the Danube during his campaign in Rumelia (while maintaining good relations with Transylvanian Jews). Early Modern Age In 1623, the Jews in Transylvania were awarded certain privileges by Prince Gabriel Bethlen, who aimed to attract entrepreneurs from Ottoman lands into his country; the grants were curtailed during following decades, when Jews were only allowed to settle in Gyulafehérvár (Alba Iulia). Among the privileges granted was one allowing Jews to wear traditional dress; eventually, the authorities in Gyulafehérvár decided (in 1650 and 1741) to allow Jews to wear only clothing evidencing their status and ethnicity. The status of Jews who had converted to Eastern Orthodoxy was established in Wallachia by Matei Basarab's Pravila de la Govora and in Moldavia by Vasile Lupu's Carte românească de învățătură. The latter ruler (1634–1653) treated the Jews with consideration until the appearance of the Cossacks (1648), who marched against the Polish–Lithuanian Commonwealth and who, while crossing the region, killed many Jews; the violence led many Ashkenazi Jews from Poland took refuge in Moldavia and Wallachia, establishing small but stable communities. Massacres and forced conversions by the Cossacks occurred in 1652, when the latter came to Iași on the occasion of the Vasile Lupu's daughter marriage to Timush, the son of Bohdan Khmelnytsky, and during the rule of Gheorghe Ștefan. According to Anton Maria Del Chiaro, secretary of the Wallachian princes between 1710 and 1716, the Jewish population of Wallachia was required to respect a certain dresscode. Thus, they were prohibited from wearing clothes of other color than black or violet, or to wear yellow or red boots. Nevertheless, the Romanian scholar Andrei Oișteanu argued that such ethnic and religious social stigma was uncommon in Moldavia and Wallachia,