The paper is devoted to the Chronicle of the Council of Constance by Ulrich Richental, in which he described the events of the church council (1414 - 1418). From the point of view of Slovak history, the chronicle is also known in relation to its mentions on the territory of Slovakia, which prove that in the 15th century, the territory of Slovakia was perceived as a special and ethnically different in the ambit of the Kingdom of Hungary. In several places, Richental mentions noblemen, whose property was located in the territory of present Slovakia as lords 'in Windischen landen'. Sometimes, a closer geographical location is given, such as on the river Vah. In Richental's Chronicle, apart from the name 'Hungary', also called in one place 'Ungerland', we also find Slovakia designated as 'Windenland'. Richental's mentions of Slovakia are very valuable, but so far more or less unknown in scientific literature.