Contessa Valentina Allegra de Fontaine is a Marvel Comics character that appears in the Marvel Cinematic Universe, played by Julia Louis-Dreyfus. She appears in The Falcon and The Winter Soldier series and in the film Black Widow.
She is gathering a batch of Earth's skilled and powerful individuals to work for the organization she is associated to. She recruits John Walker after he lost the Captain America mantle and fought Sam and Bucky, so Valentina makes him the U.S. Agent. She also tasks Yelena Belova into targeting Hawkeye in her next assassination mission, but tricks her by pointing out that he is responsible for Black Widow's death, leaving out the proper context behind Natasha's death, that being that Clint wanted to trade places with Natasha as the one to sacrifice themself for the Soul Stone on Vormir in order to undo Thanos’s snap.
Valentina Allegra de Fontaine was created by Stan Lee, Roy Thomas, Jim Steranko, Herb Trimpe and Marie Severin.