The constitutional system of Andorra is not a popular subject of study of science either in Poland or abroad. In Poland, after 1993 (the year the adoption of the current constitution) were published only a few articles or fragments of larger studies on this topic. As a result, the vast majority of these studies have mainly reporting character. Many interesting issues have been mentioned only in footnotes. Among them: the question of the status of specific, Andorran head of state and (resulting) the correct indication of the form of Andorran state. Co-principes are translated into Polish as „co-princes”. It consequently, automatically determined Andorra as a „principality”, ie the state of monarchical system, and even a constitutional monarchy . This should be considered , at least as controversial. The author formulates two hypotheses and subjected them to verify. Firstly – Andorra is a principate (not a principality) – a mixed form of political system combines elements of monarchy and republic, outweigh the latter, in addition to the relics of the former. Head of State in principate should be referred to as „princeps”, and in the case of Andorra, specifically: co-princeps. In this way we will avoid misleading comparisons with „a prince”, as monarchical, hereditary head of state. Secondly – despite the adoption of a modern constitution, there are remaining relics of feudal times in the political system of Andorra, resulting from the former status of „condominium”. This is particularly evident in the form of the Andorran heads of state institution. It also gives a partial capacity to influence decisions of the co-principes by their home country’s authorities.