Did you know that the allied spirit of an Orlanth Rex priest is the guardian spirit of the tribe? Which means that the allied spirit of the Prince of Sartar is…. Sartar!
So the Lighting the Flame is essentially where the prince allies with Sartar. And since Temertain never bothered to perform the rite…
The Flame of Sartar
A key stage in the acclamation of a Prince of Sartar is when the candidate must rekindle the Flame of Sartar. If successful, the new Prince allies with the spirit of Sartar and gains the assistance and counsel of his deified ancestor.
See why that whole lighting the Flame of Sartar thing is so important in the histories? And what it means that the Flame is extinguished?
So for Queen Leika, which one is the allied spirit? The ballista or the Black Spear? Are wyters and guardian spirits two terms for the same thing? The Black Spear is the tribal spirit, and functions as an allied spirit to the tribal rex. Maybe it is possible that they have two allied spirits.
As a general rule, no person can have more than one allied spirit from the same cult at a time. If an allied spirit is killed or destroyed, a new one may be obtained, but this is a matter for heroic deeds on the part of the Rune Lord. Of course becoming Prince of Sartar is the sort of exception that proves the rule.