The biggest castle in Galicia

Despite the general lack of information, we may speak of three salient construction forms in Galician fortresses if we look at a specific areas like, for instance, the peninsula of Morrazo:

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The fortress of Mount Liboreiro, located on an ancient castro (prehistoric fortified settlement) is a good example of a fortress with a great strategic value and great difficulty of access. Its role was to defend or control a wide territory, and the size of its rooms suggests plurifunctionality, including a residential use. This is the first stage of encastellation in Galicia. These are very ancient but short-lived castles: from late 9th century until early 11th century. 
• The castle of Darbo has some similarities with the previous one but it is at a lower altitude and access to it is easier, which allows for more immediate and intense contact with the lands around it. Its structure is defined by a granite rock where it lies and these castles are long-lasting strongholds. Throughout its existence, they grow bigger and their architecture becomes more complex. Most of the Galician fortresses that have reached us have similar characteristics. As Torres do Oeste, those of A Lanzada, Cedofeita or Pontesampaio, to mention but a few, are part of a defensive system devised by the prelacy of Santiago to counter Norman and Saracen piracy that infested the Galician coast between the 10th and 12th centuries.
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The third example is Torre de Meira. It is not on top of a mountain but on the ledge on the skirt of the mountain, at a low altitude and with good natural defences. It does not dominate a great territory but it controls a rich valley, which also seems to indicate a different relationship with the human ecosystem around it. They were built from the central centuries of the Middle Ages (12th-13th centuries). What is important in these castles is the tower while the enclosure plays a secondary role. This feature grows more prominent with time to the extent that the tower becomes detached from the fortress to become a purely agricultural construction in the full Middle Ages.