My admission a few years back that I hadn't read this evoked responses
of varying enthusiasm. It's Silverberg's most popular novel by far on both
LibraryThing and
Goodreads, and I had really really intended to read it when it first came out in 1980, but somehow never got round to it. (Memory is tricky - I was sure I'd seen Dave Langford reviewing it in White Dwarf around that time, but it looks like he didn't.)
Anyway, it was a serious effort to shift Silverberg's output from SF to big commercial fantasy, clearly drawing on older models, particularly Zelazny (amnesiac hero discovers that his crown has been usurped) and Vance (adventures across a world of varying magical creatures). We've had an awful lot more of that kind of thing since, and though some of it has been done better, most of it has been done worse. The setting of the multi-species travelling circus is nicely developed. The general thrust is uplifting - it's not just about divine right of kings, it's also about earning the right to rule through sufficient popular support (and, er, winning the battle at the end of the book). It was as much fun as I hoped it would be, but I don't feel any particular urge to track down and read the sequels.