The first incarnation of Crimson Cowl, created by writer Roy Thomas and artist John Buscema, first appeared in The Avengers #54 (July 1968).
[1][2] The second incarnation of Crimson Cowl, created by Kurt Busiek and Mark Bagley, debuted in Thunderbolts #3 (June 1997).
[3] Ultron posed as the original Crimson Cowl in order to lead his own version of the Masters of Evil with Edwin Jarvis as a brainwashed body double.
[4] Justine Hammer constantly tried to prove her worthiness and uses the supervillain community to accumulate power for herself as the second Crimson Cowl, the leader of her own version of the Masters of Evil.
[5][6] Additionally, her Crimson Cowl cloak framed Dallas Riordan as a set-up,[7] and gets utilized by Silver Sable.