Knight's Armor

Knight's Armor is a recurring armor in the series. It is often a low to mid-rank armor, but provides a decently high defense compared to most other armor found around the point in the game that it is obtainable.

Final Fantasy
Knight's Armor is a low-rank armor, but provides excellent defense when it is first acquired. It is only usable by Fighters and Knights, and can be bought in Melmond. It provides a whopping 34 Defense, but also 33 Weight, making it the heaviest armor in the game.

Final Fantasy II
Knight's Armor is a mid-rank armor, and can be bought in Mysidia for 5000 Gil. It provides +22 Defense, -26% Evasion, and +5% Magic Defense.

Final Fantasy III
Knight Armor is a mid-rank armor, usable only by Freelancers, Onion Knights, and Knights. It provides a mediocre +25 Defense and +7 Magic Defense.

Final Fantasy Crystal Chronicles: Ring of Fates
Knight Armor is a mid-rank armor that requires the Knight's Uniform scroll. It provides +42 Defense.