Their medieval history is closely linked to the emergence of the Batzar Nagusiak or "Grand Meetings", especially those of Biscay and Gipuzkoa (Juntas Generales de Vizcaya/Guipúzcoa in Spanish) and the establishment of parochial churches.
Njihova srednjovjekovna povijest usko je povezana s pojavom Batzar Nagusiak ili "Velikih Susreta", posebno onih u Biskaji i Gipuskoi (Juntas generales de Vizcaya / Guipuzcoa na španjolskom) i osnivanjem župnih crkava.