Zug (German), French  Zoug,  capital of Zug canton, north central Switzerland, on the northeastern shore of Lake Zug (Zugersee), at the foot of the Zugerberg (3,409 ft [1,039 m]), just south of Zürich. First mentioned in 1242 as a possession of the counts of Kyburg, it was purchased by Rudolf IV of Habsburg (later Rudolf [...]