Masinloc's written history begins when outsiders began writing. Its actual history does not, and holding those two apart is the hardest thing in this work to do honestly.
People were living on this coast, in these lowlands and in the uplands behind them, long before any of it was recorded. That much is certain in principle. What is not available is the detail: the exact villages, the leaders, the dates, the social boundaries. Those have not been reconstructed from the sources currently held.
Two mistakes, in opposite directions
The first is to let the record stand in for the reality — to write as though Masinloc began when a chronicler arrived. That converts colonial attention into an origin story, and it quietly erases everyone who was already here.
The second is to compensate by inventing, and it is the one I have had to talk myself out of. A detailed precolonial narrative with named chiefs and dated settlements would be more satisfying to read and would not be history. Absence of surviving documentation is not evidence of absence; it is also not a licence.
Say exactly what the evidence allows, and say plainly where it stops.
What can be said
The geography is clear: a coast, lowlands, and highlands behind them, connected rather than separate. The language points the same way — Sambal belongs to the Sambalic branch of the Central Luzon group, and that relationship is older than any Spanish record of it.
The missionary sources preserve something too, though they have to be read against themselves. They record lowland Christian settlements, upland Aeta resistance and the coastal environment, in language that is strongly colonial and often prejudiced. The information can be used; the framing has to be examined rather than inherited.
So the honest position is a connected landscape rather than a fixed map of separate peoples, and a firm statement that the people came first — with the specifics left open until archaeology, language research and community knowledge can fill them properly.
See also: the standard we hold historical claims to.