The "Ortsgemeinde" of Külz came into being through the merger of the "Ortsteile" of Eichkülz on the one hand and Külz with the "Ortsteil" of Gaß, the boundary between which was the Külzbach, on the other. Eichkülz lay on the brook's right bank in the former territory governed by the provost at Ravengiersburg Monastery. The two other centres over on the brook's left bank, however, lay in the former Imperial territory that King Albrecht pledged to Count Simon II of Sponheim in 1302. These Imperial rights were acquired shortly thereafter by the Elector of the Palatinate.