GELNHAUSEN, a town of Hesse-Cassel, province of Hanau, on the right bank of the Kinzig, 12 miles E.N.E. of the town of Hanau. It was formerly an imperial city, and was for some time the residence of the emperor Frederick Barbarossa. The ruins of his palace still exist on an island in the river. Being on the highroad from Frankfurt to Fulda and Eisenach, it is a place of considerable trade. Pop. 4000.