In this chapter, I analyze uses of the past in the official discourses of the Orthodox Churches in Ukraine from 1988 to 2018 using the example of the celebration of anniversaries of the Christianization of Kyivan Rus’. My main argument is that each Orthodox Church makes references to the past as it attempts to position itself as the ‘patrimonial Church’, namely, the most traditional and historically justified church for Ukrainian society. I propose a theory that applies the concept of a patrimonializing process to post-Soviet Ukraine in order to better explain a religious situation in which Church-building goes in parallel with nation- and state-building.