Tayy
... that by the 13th century, the Tayy were the dominant Arab tribe in the Syrian steppe, Upper Mesopotamia and north-central Arabia?
... that by the 13th century, the <b id="mwB7M"><a href="./Tayy" id="mwB7Q" rel="mw:WikiLink" title="Tayy">Tayy</a></b> were the dominant <a class="mw-redirect" href="./Arab" id="mwB7U" rel="mw:WikiLink" title="Arab">Arab</a> tribe in the <a class="mw-redirect" href="./Syrian_steppe" id="mwB7Y" rel="mw:WikiLink" title="Syrian steppe">Syrian steppe</a>, <a href="./Upper_Mesopotamia" id="mwB7c" rel="mw:WikiLink" title="Upper Mesopotamia">Upper Mesopotamia</a> and <a href="./Najd" id="mwB7g" rel="mw:WikiLink" title="Najd">north-central Arabia</a>?