When was Madelyne "Maddie" Jennifer Pryor-Summers first introduced by Marvel Comics?
Madelyne Pryor
Madelyne's hairstyle design was modeled off the book's editor at the time, Louise Jones (later Louise Simonson)[1]—a design retained on the character until 1988. Claremont named the character after Steeleye Span singer Maddy Prior.  Claremont had already created a character named "Maddy Pryor", a little girl that appeared very briefly in Avengers Annual #10 (1981), and has no in-story connections to the X-Men character.[2] Claremont, nonetheless, years later took an opportunity to indulge in an in-joke:  in Uncanny X-Men #238 (1988), a similar child would appear as Madelyne's mental image of herself, wearing the same clothes as the little girl from Avengers Annual #10, repeating the girl's same line of dialogue, but also singing "Gone to America", one of Steeleye Span's biggest hits.