Has the limit on regenerations for Time Lords shown in The Time of the Doctor always been canon, or was this was made up just for this episode?
The regeneration limit is old canon from the Tom Baker era as established in "The Deadly Assassin". It comes up a number of times thereafter. Particularly in the context of the Valeyard from the Colin Baker era and various schemes of the Master to "get more lives" as it were.
The canon limit is from the Fourth Doctor (Tom Baker) in The Deadly Assassin and was recently changed / modified In The Time of the Doctor.
RE: The Deadly Assassin:
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