The Teigas measure is a measuring system, in stone, which can be found inside the Church of S. Miguel.  It is a roughly hewn block of granite with two unequal cavities that communicate to the outside through an orifice with a respective channel.

The Teigas word, of Arabic origin, derives from “talica”, which means “bag”, “pouch” or “shepherd’s wallet”, and it seems it related to the Galician-Portuguese countryside.

It is an ancient measuring system, widely used in the Medieval Ages, that has a rather variable magnitude.  The monarchs of the time of the reconquest had the habit of providing smaller measures to new towns conquered and, due to the fact that there was no law that determined its value, many injustices and abuses took place.  According to the Abbot of Tagilde, one of the first towns to receive a "licensed" measuring system was Guimarães with the so-called “Teigas measure”.