Ronkan Knight is an enemy in Final Fantasy V. It is a strong enemy with high defense when fought in the Ronka Ruins. They are also one of the enemies summoned by Zephyrus, and are slightly more powerful then, but the summoned version doesn't count in the bestiary.
It uses Sling to attack and poison two targets at once. Using magic is advised to defeat them. Strong defense classes, such as Knight, help with dealing with their attacks, as a Knight can use Guard to nullify their attacks.