 By the 1630s, Cotabato had become a coastal power.In the early 17th century, the largest alliance composed of the Maguindanao, Maranao, Tausug, and other Muslim groups was formed by Sultan Kudarat or Cachel Corralat of Maguindanao, whose domain extended from the Davao Gulf to Dapitan on the Zamboanga Peninsula.Several expeditions sent by the Spanish authorities suffered defeat.