We can see by this quotation from Dr. J. Lee Lehman, The Book of Rulerships, p. 7 :
There is a rule that goes back at least as early as Bonatus (actually Guido Bonatti, thirteenth century) to the effect that a malefic (read Saturn or Mars) is less malefic if it is dignified (Aphorism 41). Henry Coley translated it as "If an Infortune, being Significator, be in his own House or Exaltation, or in his own Terms or Triplicity, or in Angles or Succedent Houses; for by all these means he is fortified, and shall be counted strong as a Fortune."
(given by Martine) that the discussion above was partly based upon a wrong conclusion made by
Lehman: She
confuses dignified with fortified pretending, Bonatus 41st Consideration says "dignified" whereas it speaks expressly of "fortified".
And that
there is a difference - for Bonatus too - between "fortified" making an Infortune counted "strong as a Fortune" and "dignified" - abating his malice - , you can read in his 40th consideration:
"The 40th is, To consider if an Infortune, whether be he significator or not, be peregrine, that is
not in any of his
dignities, for then his
malice is encreased; but when
in his
dignities it
somewhat abates it: that is in his House, Exaltation, or Terms; but in his Triplicity or Face very little, and in Haym least of all."
All in all Lehman is here not conform with the teachings of the Tradition.