Dante Redgrave
Son of Sparda
What we know of Lady is; her mother was named Kalina-Ann, her father was Arkham, and likely through her mother, she's descended from the priestess, who may possibly have been a lover of Sparda's. The last part is theory, keep in mind, but the facts we have fit. Arkham was a librarian in some kind of "church" respository of legends and history, and from that, we have learned that because Dante and Vergil were born in the modern era(they were late teens in DMC3, Eva's picture is a color photograph, Dante's very much a modern teenager in DMC3, the murder of their mother was twenty years prior in DMC1), the fact a legend exists of Sparda fathering twins in the past means they are NOT his only cambion brood.
But this means that Lady was probably not trained by a similar order to Fortuna's Order of the Sword, she likely would have already known of them before their encounters pre-DMC4.
But this means that Lady was probably not trained by a similar order to Fortuna's Order of the Sword, she likely would have already known of them before their encounters pre-DMC4.