The members of an "Eidgenossenschaft" are called "Eidgenossen" (singular "Eidgenosse"). This term is documented in an alliance from 1351 between the communal, countrified lieus of Uri, Schwyz and Unterwalden and the civic city lieus of Lucerne and Zürich, which referred to themselves as such. In the evolution of the Swiss Confederacy, the members initially were not united by one single pact, but rather by a whole set of overlapping pacts and separate bilateral treaties between various members. The abstraction to the singular use of "Eidgenossenschaft", which implies a stronger sense of community and the perception of a strong common cause, did not occur until some forty years later, after the Battle of Sempach, although it began already in the "Pfaffenbrief" of 1370, a treaty among some of the then eight members of the Swiss Confederacy.