Crown of the Pirate Lord

The  is a legendary item that is obtained upon completing all of the requirements for the Pirate King's Crown. It provides 20 defense against pirates. Upon killing a pirate, it will grant two buffs that last for a minute, one giving you 35 Strength while the other gives you 3 Speed.

Source

 * Pirate King's Crown

Trivia

 * Although the item's tooltip says that it gives 20 Axe Armor, it actually gives 20 armor against all pirates, regardless of what weapon they're using. This is probably because, before the introduction of Pirate Strongholds, all pirates used axes as weapons.