It is strange yet scarcely difficult to the imagination to realise the first embodiment of what is now Edinburgh in the far distance of the early ages. Neither Pict nor Scot has left any record of what was going on so far south in the days when the king's daughters, primitive princesses with their rude surroundings, were placed for safety in the castrum puellarum, the maiden castle, a title in after days proudly (but perhaps not very justly) adapted to the supposed invulnerability of the fortress perched upon its rock. Very nearly invulnerable, however, it must have been in the days before artillery; too much so at least for one shut-up princess, who complained of her lofty prison as a place without verdure.