It is impossible to understand the phenomenon of disinformation without unraveling the more perplexing notion of “truth.” This article explores how a Bulgarian psychic or prophet named Baba Vanga (1911–1996) became one of the most noteworthy mediums of “truth” in twentieth- and twenty-first-century Russian imagination. With Bulgarian-Russian transnational ties as context, we trace how belief in Baba Vanga’s abilities and prophecies was propagated by witnesses via word-of-mouth, newspaper articles, books, TV programming, and the internet. We periodize the ways Vanga secured a place in Russian “truth worlds,” drawing upon both science and religion or a conglomeration of both. We look deeper into the origins and more recent circulation of a purported Vanga prophecy from 1979: namely, that Russia would rise to be the ruler of the world. The dissemination of this message, we argue, is not a Russian state plot to bolster aspirations in Ukraine and its standoff with the West. Instead it has been transmitted in far more fragmented and mediated ways and even countered by the Russian Orthodox Church. A deeper pondering of these mediations of Baba Vanga can help us better understand what we call the “post”-truth world, in which truth is crafted by online “posts.” In contrast to the notion of “post-truth” that posits a dearth of truth, our concept of “post”-truth recognizes that truth is not just in unprecedented excess today but is built through a complex and participatory bricolage that uses science and religion to build shared realities as never before in history.