Btw., Saruman only settled in Orthanc/Isengard after Rohirim came to Rohan, didn't he? i have the impression that before that he was a wandering wizard, much like Gandalf.
I even seem to recall that Gandalf later suspected that Saruman only settled in Orthanc in the hopes of finding the Palantir there - which he, as we all know, did.
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