Fosi

FOSI a small German tribe, of which nothing is known beyond what Tacitus ( Germ. 36) relates of them, viz., that they were subject to the Cherusci, and became involved with them in their ruin. The banks of the stream Ferse, in Brunswick, are generally looked upon as the country once inhabited by them, and the little town of Fosenbrockmay have derived its name from them. In the time of Ptolemy their country was already occupied by the Langobardi.
[L.S]