>What was the name of Sartar (the principality), when Sartar ruled it?
The Quivini (named for the Mountains in and around Boldhome).
>What was then the wyter of Boldhome, assuming that it is Sartar now?
Sartar is not the Wyter of Boldhome. He protects (or used to) protect the entire kingdom. The Wyter, I think, is the spirit he brought back from his Crown Test (KoS p218).
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