The Knights of the Round Table tells the story of the British legend King Arthur and the round table knights. They searched for the Holy Grail. All the knights sat around the round table with King Arthur and Queen Guinevere. King Arthur has a great wizard named Merlin by his side. Merlin cast a spell on the chairs around the round table. When the knight who should sit in that position sat on the chair, the chair would display that person's name. They are the Knights of the Round Table.
The Golden Knights were the highest-ranking Praetorian Guards of the Vatican in the Middle Ages.
The Knights Templar formed the Order of the Templars in order to protect themselves after the Holy See gradually lost power after the Crusades. But later the Templars gradually became stronger and posed a certain threat to the Holy See.