Beat back and slew a southern king, through wrath
And puissance of Gwydion, whose path
Thence on, with love, he honored.
Now this Math
Was learned in wondrous witchcraft: as he willed,
He wrought the invisible visible, and filled
The sight with seeming shapes, which it believed
Realities, nor knew it was deceived.
For, at his word, the winds were wan with tents,
And armies rose of airy elements;