Gerasus
Gerasus a river of Dacia (Amm. Marc. 31.3.7), which Jornandes (de Get. 22) calls GRISSIA and the Geographer of Ravenna GRESIA. Schafarik (Slav. Alt. vol. i. p. 507), who makes it out to be the same as the CUSUS of Tacitus (Tac. Ann. 2.63), identifies it with the Körös, an affluent of the Theiss.
From William Smith (ed.), Dictionary of Greek and Roman Geography. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.