Two small Muslim trading kingdoms existed by that time at Pasai and Peureulak or Perlak .
But substantial evidence of Islam in Indonesia begins only in northern Sumatra at the end of the 13th century .
Two small Islam trading kingdoms existed by that time at Pasai and Peureulak or Perlak .
But substantial evidence of Islam in Indonesia begins only in northern Sumatra at the end of the 13th century .