Combine brown sugar, flour, pecans, raisins, and cinnamon in a medium-sized bowl and work with a fork or your fingers until well combined.
Add melted butter and mix to combine.
Take one of the balls of dough and roll it out into a rectangle about 10 by 16 inches, and distribute half of the filling on the rectangle of dough.
Working from the longest edge, roll the dough into something resembling a jelly roll or log. Form into a ring and place on a greased baking sheet.
Using scissors, cut 1/3 of the way through the ring, each cut about an inch apart, all the way around the ring.
Cover and let rest until doubled in size, about 45-60 minutes.
Preheat oven to 375°F.
Bake for about 30 minutes, rotating and shifting baking trays top to bottom about halfway through.
Take the Kings Cake out of the oven and let cool for about an hour before frosting.