Radovid V

Radovid V the Stern is the current king of Redania. He's the son of Vizimir and Hedwig of Malleore, and thus a brother of Dalimira and Milena.

Radovid is mentioned then and again throughout the game, but in Act III, Geralt gets to meet the king face to face, and then again in the Epilogue.

In the game, Radovid is attempting the same thing his father tried couple of decades before: joining the royal families of Redania and Temeria. Because of this, he asks Geralt's opinion about Adda.

If Geralt manages to break Adda's curse anew, there is a scene of the happy couple promising a bright future. If Geralt kills the striga, though, Radovid reigns alone.

Trivia

 * Redanian Herbal, according to its description, is called "stern" in honor of Radovid.