The author presents the preliminary results of the excavation of the Mikulčice acropolis fortifi cation near Church II. Any rampart is the largest such structure built by the Mojmír dynasty. The importance of this particular fortifi cation lies in the fact that it is the rampart of the main area of one of the top Great Moravian centers of power that protected, among other things, a number of religious buildings and a district with the only properly documented stone palace of a Great Moravian ruler. Great Moravian rampart is composed of a stone face wall, clay-wood core strengthened by grates and a stone substructure ringed by stake palisades, in front of, and in some places partially under, the face wall. The substructure’s role was most likely to bear the face wall’s weight and to strengthen the artifi cial slope under it against water erosion by the nearby river. The conclusion poses the main issues and unknowns that remain to be discovered and answered about the Mikulčice fortifi cation, Marian Mazuch., and Obsahuje seznam literatury