Grails mysteries

I shall have a son, out of Cornwall shall he come, that shall be a wild boar, bristled with steel... he shall be a man most brave and noble in thought Thou shall kneel for him, for every man shall humble in front of our lord I stood upon the sand of the sea and the great wind told me to carry on He shall once know the secret of Holy Grail And so was the coronation made And there was he, sworn unto his lords and the commons to be true king