Karl Deutsch (in "Nationalism and its alternatives") suggested that a nation is "a group of people united by a mistaken view about the past and a hatred of their neighbors." This phrase is frequently, but mistakenly, attributed to Renan himself. He did indeed write that if "the essential element of a nation is that all its individuals must have many things in common", they "must also have forgotten many things. Every French citizen must have forgotten the night of St. Bartholomew and the massacres in the 13th century in the South."