Girl Genius
Girl Genius
This article is about a member of House Heterodyne. For others in the lineage or other uses, see Heterodyne (disambiguation).
This article is about a member of House Mongfish. For others in the lineage or other uses, see Mongfish (disambiguation).

Klaus Barry Heterodyne was born in "1_72"[1] to Lucrezia Mongfish Heterodyne and Bill Heterodyne. He was named after, first, his father's best friend Baron Klaus Wulfenbach, who had disappeared two years and three months before the child's birth[2]; and second, his uncle, Barry Heterodyne.

He was killed by falling debris[3] when he was only 407 days old[4] during an attack on Castle Heterodyne, at which time his mother also vanished mysteriously.

Neither the fact of his death, nor Agatha's subsequent birth, was generally known[5] in Mechanicsburg. Both Klaus Barry Heterodyne and Lucrezia Mongfish would most likely have been missing and presumed dead after the attack. According to Zeetha, the popular Heterodyne stories suggest Klaus Barry was kidnapped.[6]

The fact of Lucrezia's pregnancy at the time of the attack was likely not generally known; in addition, the Heterodynes rarely father girls[7]. Thus any speculation about a lost Heterodyne heir would center on the survival of Klaus Barry Heterodyne; if the child with whom Lucrezia was pregnant at the time were considered in any speculation, that child would have been assumed to be male as well.

The absence of an announcement of Klaus Barry Heterodyne's death could simply have been the result of the absence of the Heterodyne Boys after they dealt with the immediate aftermath of the attack, and Carson von Mekkhan going into hiding afterwards, or it could have been the result of a general policy of limiting the amount of information available to outsiders, or done specifically to protect Carson, any Heterodyne heir to which Lucrezia might give birth, or both.

Von Pinn served as Klaus Barry's "nursemaid" and went mad at his death. We later learned that she existed for about 200 years before Klaus Barry's birth, having originally been the Muse Otilia created by Van Rijn for the Storm King and later transferred by Lucrezia into a construct body that could not resist Lucrezia's commands.

His younger sister is Agatha Heterodyne, although she did not find this out until she was eighteen — just as many who knew Klaus Barry were in turn unaware of her.

See Also[]


  1. Either 1872 or 1972, based on other dates in the narrative. We see his tombstone , but Agatha's foot is covering the bottom part of the digits in the century.
  2. Ibid. Note that the length of time obviates any question of paternity with respect to his primary eponym.
  3. Vol. VII p. 73
  4. op cit
  5. a soldier notes that his aunt was one of the midwives, and that the Doom Bell was rung, apparently in connection with the public announcement of the birth
  6. "The Heterodynes return to find Lucrezia and the young son kidnapped."
  7. der Kessel says this (Vol. VII p. 84 )