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This topic might have a better name.

The War Games should be the dab term, since that was his first appearance; however, he wasn't a chancellor in that story.

Talk about it here.

The third Time Lord member of the Second Doctor's tribunal sentenced him — with his peers — to exile on Earth. (TV: The War Games) The same Time Lord was Chancellor during the crisis that required the help of the first three incarnations of the Doctor. (TV: The Three Doctors)