The Wadai Empire or Sultanate was a kingdom located to the east of Lake Chad in present-day Chad and in the Central African Republic. It emerged in the sixteenth century as an offshoot of the Sultanate of Darfur (in present-day Sudan) to the northeast of the Kingdom of Baguirmi. In 1635, the Maba and other small groups in the region rallied to the Islamic banner of Abd al-Karim, who led an invasion from the east and overthrew the ruling Tunjur group. Abd al-Karim became the first Kolak or Sultan of a dynasty that lasted until the arrival of the French. During much of the 18th century, Wadai resisted reïncorporation into Darfur.