Osi
Eth. Osi a German tribe mentioned only by Tacitus (Germ. 28, 43), as dwelling beyond the Quadi, in a woody and mountainous country. But their national customs, as well as their language, were those of the Pannonians. They were, moreover, tributary to the Quadi and Sarmatae. The exact districts they inhabited cannot be determined, nor do we know whether they had migrated into Germany from Pannonia, or whether they were an ancient remnant of Pannonians in those districts.
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.