A group of knights is called a "brotherhood" or an "order."
Knights of the round table.
Pieces of land given to knights as payment were called fiefs.
Some knights were called sirs as they were knighted by a king/Queen for different reasons.
The code of conduct for knights is called a Chivalry.
You might be thinking of Pretear. There are these knights called Leafe Knights or something, and they fight against these things called larvae that start out looking like seeds.
Uhhh . . . the Knights of the Round Table?
dowager
Chevalier
Chevalier
The legend says that they were The Knights of the Round Table.
Knights who demonstrated their fighting skills in contests were often called tournament knights. Tournaments were events where knights competed against each other in various combat activities to showcase their prowess and skill.