The Chatti (also Catti) were an ancient Germanic tribe settled in central and northern Hesse and southern Lower Saxony, along the upper reaches of the Weser river and in the valleys and mountains of the Eder, Fulda and Werra river regions, a district approximately corresponding to Hesse-Cassel, though probably somewhat more extensive. According to Tacitus (Histories iv. under 70 http://classics.mit.edu/Tacitus/histories.4.iv.html), among them were the Batavians, until an internal quarrel drove them out, to take up new lands at the mouth of the Rhine.