Apart from a last-minute title change to Corum: The Prince in the Scarlet Robe, and a new cover painting, this Fantasy Masterworks offering is identical in every respect to the (still in print) version of the first three Corum books issued as Volume 4 in Moorcock's Tale of the Eternal Champion series, also published by Gollancz.
That said, if you're a fan of sword and sorcery and have never encountered this particular Moorcock hero then get hold of a copy now. While I have always been more of a fan of Elric, Hawkmoon and Jherek Carnalian, it was actually a pleasure to read these stories again. Indeed it's hard to believe that they are now over thirty years old. Each of the volumes contained in this omnibus fail to reach the two-hundred page mark, and they remain an abject example of prose which is economical yet bursting with ideas - a lesson which today's writers of fat fantasy tomes could do well to learn from. Reading some of the more breathlessly inspired passages, you can almost see Moorcock behind the typewriter, getting new ideas faster than he can set them down. This make-it-up-as-you-go-along style of writing does have its flaws, however, and things do become a little erratic in the third part, with guest appearances from both Elric and Erekose, the original Eternal Champion himself. Nevertheless this is a must-read volume and I presume the title change is because Gollancz intends to bring out the second trilogy of Corum adventures, The Prince with the Silver Hand, at some point in the future.