A stone architectural segment was discovered in the area of the Oponice castle's upper castle during archaeological excavation in 2018. It probably comes from an entry portal and was carved with a Renaissance coat of arms with the motive of a four-legged animal on which the bird sits. The coat of arms probably belongs to the Horváth family. They are mentioned in the historical written sources as castellans at the Oponice castle in the second half of the 16th and the first half of the 17th century. In addition, in this time there are other proofs of the relationship between the Horváth family and the Aponi family, who had owned the castle from the end of 14th, respectively the beginning of the 15th century.