No, no. They were just one more community; there has been a lot of Bangladeshi propaganda about them; they were not among the early settlers, but were immigrants of a fairly late vintage, the eighteenth and nineteenth centuries at the earliest. They keep conflating their own status with that of the earlier Muslim segments of the local Myanmarese population; by 'earlier Muslim segments', I mean both those descended from foreign stock, and those converted from local families. The Rohingyas were identified as a separate community pretty late in the day; the lack of evidence of their existence earlier than two centuries ago seems to indicate that they came in during this period. Before the name Rohingya came into vogue, they were known as Chittagonians (from the famous port at Chittagong) or as Bengalis.