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THIRD PERIOD 528 HERMITAGE CASTLE of the old castle to deal with, the usual form had to be modified, the result being that the keep assumed the very uncommon form of a double tower with a small central courtyard (shown by cross hatching on Plan). The next transformation of the castle's appearance was effected by the addition of the towers at the four angles. This extension of the castle probably took place early in the fifteenth century. It was then STONE B01U PIG. 451. Hermitage Castle. Plan of Ground Floor. that the simple keeps began to be extended by buildings round the courtyards, and when castles containing large and numerous apartments, such as Doune, were erected. Here we have the same result produced
