This information about the original farmhouse is important because at that time it was intended to indicate that its owners were aware of the Biscayan origin of their ancestors and the ‘purity’ of their blood (i.e. that they had no consanguinity with the Moors, Jews or those returned to the faith). Despite being radically racist today, those who met this requirement at the time were assigned a degree of social hidalgo. Moreover, as they were hidalgos, they obtained tax exemptions and could even have a coat of arms, although not all hidalgos had one. Heraldic coats of arms are really elements of information about the personality, past and social position of their owners.

Of all the municipalities in Bizkaia, Elorrio is the one with the largest number of heraldic coats of arms. Exactly 69, 38 of them are in the town centre and 31, in rural areas.