Graden was one of the witch hunters in King Radovid's service. Unlike a great many of his comrades, he came across as a level-headed fellow, one free of prejudice, at least in his dealings with witchers.
Geralt's subsequent encounters with Graden confirmed his suspicion that the man was not a typical hunter. Graden was unorthodox in his methods, prioritizing results over ideological purity and a strict adherence to the hunters' codex, even though, as he was undoubtedly aware, this approach would hardly endear him to his superiors.
After the affair in the swamp was over, he returned to Oxenfurt, taking Tamara with him.