Gladius

The Gladius, also called the 'Gradius, is a recurring dagger in the Final Fantasy'' series. It is usually among the mid-powered daggers available with varying effects.

Final Fantasy
The Gladius has mediocre attack power.

Final Fantasy III
The Gladius is the strongest dagger available for the Thief in the DS release. Once the Thief class has reached Level 99, the Legendary Smith will give them the weapon. It gives +20 Agility.

Final Fantasy VI
The Gladius, originally translated as Gradius, is found in the Ancient Castle after beating the Master Tonberry. Another can be won by betting the Ultima Weapon in the Colloseum. It is the strongest universal dagger, although there exist stronger character-specific weapons, and is Holy-elemental.

Final Fantasy IX
Zidane Tribal can equip the Gladius, which can be bought at shops around the world. It possesses medicore power and the Slow status ailment. It teaches the Skills Annoy and Lucky Seven.

Final Fantasy XII
The Gladius is a dagger that can be bought in several locations. It costs 30 LP to use, is Wind-elemental, and increases Evade by 5.

Final Fantasy Crystal Chronicles: Ring of Fates
The Gladius is a low-powered dagger.

Etymology
"Gladius" is the Latin word for sword.