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From what I read Northern Luzon has ties with Java that means that Mataram/Demak would have designs in Northern Luzon if the Spanish did not set in the area first and instead Mataram/Demak would set up a puppet state/sultanate or an affiliated sultanate that rules in the plains of Northern Luzon which is Lower Pampanga river basin, Lower Agno basin and Lower Cagayan River basin but the Inland area remains Pagan or Hindu..while the Bruneians rule in the South of Luzon.
Would that mean that Islam would reach Japan earlier than christianity?