As alegend already has centuries and remembered with frequency and greater or minor number of details, some inhabitants of Castello Branco would have been seen obliged, in time of D. Alfonso III and formade of crime, to look a shelter, which had found in the Alentejo,Portugal, in the sources of the hill where if it raises the Castle of Estremoz and for where in part if espraiou the current population. It would have tremoceiros, what one was said well "copados" of what the ones that today we know, of which provided to the acolhedora shade and the searched calmness to them. With the time, the few inhabitants had proliferated e, established the first houses, formed in the Right and raised street in the end of this, what she said as parochial, the church of Santiago, the population understood to have to depute two solicitors in order to request the D. Alfonso lll granted to them charter, which they had gotten, having still chance of, to a regal consultation to inform that not having joined more than what Sun, Moon, stars and the "tremoceiro", would desire that such elements entered in its weapons (blazon of) and the population if it called Estremoz, in a "like" to the "kindless" plant of the "tremoceiro".
Dr. Mário Alberto Nunes of Coast - 1953 in tremoceiro.blogs.sapo. .pt