During the Abbassid period, in the second half of the 10th century, the "Assad" tribe, taking advantage of quarrels under the Buwayhids, penetrated into Khuzestan, where a group of "Tamim" had been living since pre-Islamic times. However, following the fall of the Abbassid dynasty, the flow of Arab immigrants into Persia gradually diminished, but it nonetheless continued. In the latter part of the 16th century, the "Bani Kaab" (pronounced Chaub in the local Gulf dialect), from Kuwait, settled in Khuzestan. And during the succeeding centuries, more Arab tribes moved from southern Iraq to Khuzestan.