This has been one of the things that has intrigued me ever since we realised how ancient the island actually is. We even saw those drawings of people who seemed to be worshiping (or running away??) from the smoke monster..
MiB has even referred to them before.
So we know they were THERE at one point in time. We don't know how they got on the island, what they did there, how they got off the island (or were they all killed perhaps..?)
What are your theories on this? I would really like this to be answered in the final episodes..I think the ancient people on the island must have had a connection with MiB and Jacob..and they were probably the ones who built the statue too.. But what happened to them..?