Ulrich

Master Ulrich is in Hearts of Stone the Grand Master of the Order of the Flaming Rose, or better said it's remnants (those who doesn't fall in war, been imprisoned or joined Mage Hunters) the so called "Fallen Knights".

Hearts of Stone Expansion
His election to this position is shrouded in mystery but he seems to be resistant of his predecessor (optionally Siegfried of Denesle). reforms and only one who he keep from him is coat of arm but shields of knights was changed and roses on them are fireing like during Jacques de Aldersberg's rule.

He was elected to fill the grandmaster position in very dark times for the Order, most of his brothers died, imprisoned, killed or betrayed their own and join the radical Witch Hunters, all fortunes and properties that kings like Foltest and Radovid V were now confiscated by the second-named king and only think what Ulrich was leader of few hundreds of knights and so he decides to avenge his dead brothers and he started to attacking caravans of the Redanian Royal Army.

He made his base of operations within a cave north of Novigrad and even starts to deal fisstech from here.

That is until Geralt of Rivia was tasked, by a female member of the "Wild Ones", to investigate the murder of her lover/mate Kluivert, a fisstech dealer, and avenge his death.

Geralt was told that her "mate", Kluivert, rode to an abandoned village of Bowdon and he starts his investigation from there. Then it led him to her lover's murderers, Ulrich and the Order of the Flaming Rose.

Trivia

 * He is likely inspired by Ulrich von Jungingen, Hoch Meister of the Teutonic Order, both lead their knights against ruler of land which once gave them property and now ruler of wants it back (Poland / Redania) and both are Ulrichs.