Later, in the days of King Arthur, the vision of the cup returned again. It was a memorable day. The seat at the Round Table, the "Siege Perilous," left ever empty for the coming of one who should, be worthy to sit therein, was filled at last by the young and fair and pure Sir Galahad, brought thither by the "ancient clothed in white." He was clad in white armour, with no sword or shield save only an empty scabbard hanging by his side. Thereupon the second marvel of that day took place. The fair sword, stuck fast in the great stone of red marble, which no other Knight had been able to move, was lightly and easily drawn by Sir Galahad, who said as he took it, "For the surety of this sword I brought none with me; for here by my side hangeth the scabbard." That same evening, after even-song in the great minster at Camelot, they were all at supper in Arthur’s Hall. "And all at once," runs the old legend, retold in Tennyson’s verse, "And all at once, as there we sat, we heard A cracking and a riving of the roofs, And rending, and a blast, and overhead Thunder, and in the thunder was a cry. And in the blast there smote along the hall A beam of light seven times more clear than day. And down the long beam stole the Holy Grail All over cover’d with a luminous cloud, And none might see who bare it, and it past. But every Knight beheld his fellow’s face As in a glory, and all the Knights arose...." All saw the light, and heard the sounds, but Sir Galahad alone had sight of the Grail itself. Whereupon all the rest took solemn vows to ride a twelvemonth and a day in quest of it. And the legend goes on to tell how they fared and what adventures they had in their quest. It is a beautiful and significant story. G.F. Watts, the artist, caught the spirit of it in his well-known picture of Sir Galahad standing by his white horse, with purity of vision and strength of high resolve written on every line of his uplifted face. Both legend and picture seem to catch and illumine an idea that was fundamental in the whole conception of Knighthood, the idea that the true Knight must be pure in heart. Sir Galahad stands forth as the type and embodiment of strong and pure manhood.