Katarina, Inga, and Serpentine can be seen as a reference or representation of the three fates of greek and roman mythology.
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The Moirai (The Fates) were the three goddesses of destiny in Greek mythology. They were Clotho, Lachesis and Atropos.
They controlled the life and destiny of everyone. Clotho spins the thread of life (begins a person's or creature's life), Lachesis measures it (looks at the how long it currently is), and Atropos cuts the thread. When the thread is cut the person dies. The Moirai are capable of destroying an immortal.
The Moirai were described as ugly old women, sometimes lame. They were severe, inflexible and stern. Clotho carries a spindle or a roll (the book of fate), Lachesis a staff with which she points to the horoscope on a globe, and Atropos (Aisa) a scroll, a wax tablet, a sundial, a pair of scales, or a cutting instrument. At other times the three were shown with staffs or sceptres, the symbols of dominion, and sometimes even with crowns. At the birth of each man they appeared spinning, measuring, and cutting the thread of life.
The Moirai were supposed to appear three nights after a child's birth to determine the course of its life, as in the story ofMeleager and the firebrand taken from the hearth and preserved by his mother to extend his life.Bruce Karl Braswell from readings in the lexicon of Hesychius, associates the appearance of the Moirai at the family hearth on the seventh day with the ancient Greek custom of waiting seven days after birth to decide whether to accept the infant into the Gens and to give it a name, cemented with a ritual at the hearth. At Sparta the temple to the Moirai stood near the communal hearth of the polis, as Pausanias observed.
The decisions of the Moriae about a person's life cannot be changed. Even Zeus is powerless to change their will.
The parents of the Moirai are not surely known. Some said they were the daughters of Zeus and the Titaness Themis, or more likely of primordial beings like Nyx, Chaos or Ananke.
Their Roman equivalent were the Parcae.
Sources: D'Aulaire's book of Greek Myths