The relative pronoun is i in this example. Its source is unkown; Patiño Rosselli (1983) suspects an African origin (which is a reasonable assumption, as neither Spanish or Portuguese has a construction with i).
Note:
My transcription of this example differs somewhat from Patiño Rosselli (1983: 177) (my source), as it is almost certainly partially in error. At any rate, the difference in transcription does not affect the discussion of the main feature examined here.