In the last milestone players discovered that the Dread Saint was none other than Bartholomew Roberts, the notorious Black Bart. Roberts has decided that its time for him to come out of the shadows and publicly take on the mantle of the leadership of the Dread Saints. His presence is felt immediately and that is the subject of Black Bart's Revenge, which is Chapter 3 of the Black Flags and Dread Saints storyline and goes live with 1.14.
Bartholomew Roberts isn't as well known Blackbeard, but he deserves to be. He was one of the most effective pirates of the era. Blackbeard was ferocious and charismatic to be sure, but Black Bart got down to business. In a four year career he ranged from Africa to the Caribbean to Canada and captured over 400 ships. Captain Kidd, on the other hand, captured less than 5. You can understand why in the world of Pirates of the Burning Sea Black Bart would not want to join the Brethren and serve under Captain Kidd.