The likeness between the "Glory" theme and a theme from Prokofiev's "Ivan the Terrible" has already been written about here. I thought I would add a link to Prokofiev's music, to demonstrate the similarity.
http://www.youtube.com/watch?v=vkLUY7z5FjY
The link goes to a one-minute clip of "Ivan the Terrible." It's really obvious at the 0:44 mark that Horner was at least inspired by Prokofiev.