Howard Pyle 
The Champions of the Round Table [EPUB ebook] 

It hath already been set forth in print in a volume written by me concerning the adventures of King Arthur when he first became king, how there were certain lesser kings who favored him and were friendly allies with him, and how there were certain others of the same sort who were his enemies.
Among those who were his friends was King Ban of Benwick, who was an exceedingly noble lord of high estate and great honor, and who was of a lineage so exalted that it is not likely that there was anyone in the world who was of a higher strain.
Now, upon a certain time, King Ban of Benwick fell into great trouble; for there came against him a very powerful enemy, to wit, King Claudas of Scotland. King Claudas brought unto Benwick a huge army of knights and lords, and these sat down before the Castle of Trible with intent to take that strong fortress and destroy it.
This noble Castle of Trible was the chiefest and the strongest place of defence in all King Ban’s dominions, wherefore he had intrenched himself there with all of his knights and with his Queen, hight Helen, and his youngest son, hight Launcelot.
Now this child, Launcelot, was dearer to Queen Helen than all the world besides, for he was not only large of limb but so extraordinarily beautiful of face that I do not believe an angel from Paradise could have been more beautiful than he. He had been born with a singular birth-mark upon his shoulder, which birth-mark had the appearance as of a golden star enstamped upon the skin; wherefore, because of this, the Queen would say: ‘Launcelot, by reason of that star upon thy shoulder I believe that thou shalt be the star of our house and that thou shalt shine with such remarkable glory that all the world shall behold thy lustre and shall marvel thereat for all time to come.’ So the Queen took extraordinary delight in Launcelot and loved him to the very core of her heart–albeit she knew not, at the time she spake, how that prophecy of hers concerning the star was to fall so perfectly true.
Now, though King Ban thought himself very well defended at his Castle of Trible, yet King Claudas brought so terribly big an army against that place that it covered the entire plain. A great many battles were fought under the walls of the castle, but ever King Claudas waxed greater and stronger, and King Ban’s party grew weaker and more fearful…