The Council of Captains was mentioned in the Clash of the Sky Galleons. It was when captains of sky pirate ships meet together to discuss what to do next in cases of mass danger. In this case, the topic was the massing of league ships and the solution agreed upon was to prepare for battle. The Council of Captains was held at Wilderness Lair aboard a sky ship, in this case the Maelstrom Seeker.