C . Seto Rosenkreuz C . Seto Rosenkreuz is the " Yu - Gi - Oh ! The Duelists of the Roses " incarnation of Seto Kaiba and portrayal of . He is a member of the White Roses of York . The historical figure he portrays has a mythos that makes it seem as though he lived to the age of 106 , and thus it is difficult to know if the person , historically or not , truly was still alive during the setting of the game . Biography . Seto and his 7 followers , the Rose Crusaders served Pegasus Crawford , a powerful Yorkist nobleman . Seto almost had the Lancastrians at the mercy of the Yorkists . With defeat likely for the Lancastrians , Margaret Mai Beaufort requested a high druid , Simon McMooran , to summon a duelist from another age . After Simon summons a duelist , ( the player ) Seto interrupts and begins to argue with Simon . Seto tells the duelist that they need 16 Rose Cards to return to their time and both sides have 8 cards , so they may side with either the Red Roses , the Lancastrians or the White Roses , the Yorkists . The player is then left to decide which side to join . If the Player joins the Lancastrians . Seto is disappointed , but respects their decision . On August 22nd , 1485 , the final battle of the " " Wars of the Roses " " takes place and the Lancastrians emerge victorious . Henry Tudor thanks the duelist and asks him to duel Seto at to finally end his evil threat . After losing Seto says that it was a duel to remember and that he is proud to have fallen at that duelists hands . But then Seto proclaims , it would take a fool to believe that , that he was truly defeated . Thanks to the duelist he could now complete the ritual for the " Great Summoning of the Roses " . He explains that he had planned all this from the start . He needed the Rose Duelist to perform the Great Summoning . He came to England and joined the Yorkists , knowing that the Lancastrians would resort to asking the high druid to summon the only duelist with power equal to his . A high powered duel involving the Rose Duelist , while all 16 Rose cards were at this location , was the Ritual . So regardless of his loss Seto was able to Summon the Rose Guardian , Manawyddan fab Llyr , who then duelled the player . Players can obtain the card " Moisture Creature " , using the find ability on D4 , while playing against Seto . If the Player joins the Yorkists . Seto tells the duelist he wishes he could join him in acquiring the Red Rose cards off the Lancastrians , but he is needed to maintain their defenses . After the duelist defeats Henry Tudor ( Yugi ) , the Yorkists emerge victorious and Seto congratulates the duelist on his victory . Seto then uses the Red Rose cards that the duelist obtains to complete the summoning , but only to accidentally summon Manawyddan fab Llyr . The Duelist then defeats Manawyddan fab Llyr in a duel . Afterwards , Seto apologises for the trouble he put the Rose Duelist through , giving the duelist a pendant , saying to show to his decendants in his / her time if they are in trouble , pledging his family ' s loyalty to the poweful duelist before reversing the spell and sending the Duelist home . Deck . Seto plays a Deck mainly based on Seto Kaiba ' s containing many of his cards from the Duelist Kingdom arc . His Spell Cards focus on increasing the ATK of his monsters and his Trap Cards deal with negating harmful moves dealt by his opponent .