The aim of this paper is Ito examine the case of the castle cabeça de terra of Refojos. On this castle there are very few written documents, dated between XI and XIII centuries and labile and uncertain material evidence. Due to the scarcity of sources, a comparative analysis will be carried out based on the castles cabeça de terra provided with more documentation, demonstrating how the multidisciplinary and comparative approach can be an appropriate methodology for the study and understanding of medieval defensive elements. [ABSTRACT FROM AUTHOR]