Lists and numbering of Buddhist councils vary between and even within schools. The numbering here is normal in Western writings.
Read more about Buddhist Councils: First Buddhist Council (c. 400 BCE), Second Buddhist Council (c. 4th Century BCE), Third Buddhist Council (c. 247 BCE), The Fourth Buddhist Councils, Theravada Buddhist Council in 1871 (Fifth Buddhist Council), Theravada Buddhist Council in 1954 (Sixth Buddhist Council)
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“Surrealism ... is the forbidden flame of the proletariat embracing the insurrectional dawn—enabling us to rediscover at last the revolutionary moment: the radiance of the workers’ councils as a life profoundly adored by those we love.”
—“Manifesto of the Arab Surrealist Movement” (1975)