Border by the River – But Where is the River? Hydrological Changes and Borders in Medieval Hungary*
András Vadas
Eötvös Loránd University / Central European University
vadas.andras@btk.elte.hu
Medieval estate borders were mostly formed by natural borders, such as hills, ditches, forests, meadows, etc. Of course, in many cases trees were marked in some form, or small mounds were built to clarify the running of estate borders. Almost none of these would seem at a first sight as firm as a border along rivers and streams. However, a closer look at law codes, customary law collections, and legal disputes that arose in connection with estate borders makes clear that, as borders of estates, bodies of water could be a basis for conflict. In this essay, I discuss sources from the medieval Kingdom of Hungary from the thirteenth to the sixteenth centuries that concern the problem of the change of land ownership as a consequence of changes in riverbeds.
In the late medieval compilation of the customary law of Hungary by Stephen Werbőczy, the Tripartitum, a surprisingly long section is dedicated to this problem. He clearly suggests that landownership does not change if a piece of land is attached to another person’s land by changes in the course of a river. Historians have drawn attention to this section of the Tripartitum and have suggested that this is one of the few parts in which Werbőczy does not apply Hungarian customary law, but rather uses Roman law. In my paper, which is based on a collection of similar lawsuits, I aim to demonstrate that there are a number of examples of cases in which Roman law prevailed before Werbőczy’s work, and, thus, the land in question was left in the hands of the previous owners as well as decisions according to which the shifting riverbed went with a change in ownership.
Keywords: Legal history, water history, customary law, rivers, boundaries