Bonaventura da Brescia seems to dislike the tritone. In his Brevis collectio artis musicae he writes:

ipse tritonus est principium, medius et finis omnium dissonantiarum (the tritone is the beginning, middle and end of all dissonances)

and:

tritonus est trium tonorum, quod est contra proprietatem naturae (a tritone [consists] of three tones, which is against the proper way [or perhaps "property", inherent quality] of nature).

But in my quick scan of his book so far I haven't found any mention of a legal prohibition.

T.