During the Ottoman period (1516–1922), some large Kurdish tribal groups both settled in and were deported to areas of northern Syria from Anatolia. The largest of these tribal groups was the Reshwan confederation, which was initially based in the Adiyaman region but eventually also settled throughout Anatolia. The Milli confederation, which was documented in Ottoman sources from the year 1518 onward, was the most powerful tribal group and dominated the entire northern Syrian steppe in the second half of the 18th century. The Kurdish dynasty of Janbulads ruled the region of Aleppo as governors for the Ottomans from 1591 to 1607 and its most notable member, Ali Janbulad, allied with the Medici of Tuscany. At the beginning of the 17th century, districts of Jarabulus and Seruj on the left bank of the Euphrates were settled by Kurds. In the mid-18th century, Ottomans recognized Milli tribal leaders as "iskan başi" or chief of sedentarization in Raqqa area. They were given taxing authority and controlling other tribes in the region. In 1758, Milli chief and "iskan başi" Mahmud bin Kalash entered Khabur valley, subjugated the local tribes and brought the area under control of Milli confederation and attempted to set up an independent principality. In 1800, the Ottoman government appointed the Milli chief Timur as governor of Raqqa (1800–1803).