In the armor stone located at the fortress's first entrance can be found a representation of the marriage consolidating the dominion of the Moscoso clan, beginning in the fifteenth century and continuing over time to include the Mariño estate and the Earldom of Trastámara.
On the left side of the coat of arms, we can observe the severed head of the famous wolf of Moscoso, with its corresponding drops of blood in the lower portion. On the right, the Castro roundels can be seen along with the cauldrons of the Lara clan. This image of nobility is thus the result of the union, through marriage, of the Moscoso clan with Juana de Castro and Lara.
It would actually be the son of Rodrigo and Juana, Bernal Yanez de Moscoso, in his post of Pertigueiro Mayor of Santiago, or patron, who initiates conflicts with the Compostelan bishops, first with Rodrigo Luna and later with Alonso II of Fonseca, going so far as to imprison the latter in the East Tower of the Castle of Vimianzo. However it will be his nephew, Lopo Sánchez de Moscoso, who expands the dominion of the Moscoso estate over the current Terra de Soneira and attains the title of Count of Altamira.
In 1870 the sister of the 15th Count of Altamira sells the property to Ramón Martelo, president of the Provincial Council of A Coruña. His son Evaristo, Minister to A Coruña and a poet in the Galician language, conditions the castle to be a summer residence. It is possible that he is responsible for the aforementioned armor stone, a nobleman's interpretation of the castle's history.