This article is about an intact ceramic vessel uncovered inside the Marienburg fortress during archaeological investigations carried out in 2014. The vessel is of a four-cornered shape which, as far as is currently known, is uncommon inside the Carpathian Arch. In terms of its shape and other features, it is currently the only Bodrogkeresztúr artefact of its kind to be uncovered at Feldioara/Marienburg. Immediately underneath the vessel, several sherds were found which corroborated the assignation of the artefact. All the ceramic pieces - including the four-cornered vessel - were uncovered in an undisturbed stratum which contained an array of materials dating back to the Hunyadihalom culture. The artefacts exhibit both decorative elements of Old Furchenstich style and features characteristic of the pill-shaped handle horizon.