Maldivian language
The oldest Sinhalese Prakrit inscriptions found are from the third to second century BCE following the arrival of Buddhism in Sri Lanka, while the oldest extant literary works date from the ninth century. The closest relatives are the Vedda language (an endangered, indigenous creole still spoken by a minority of Sri Lankans, mixing Sinhala with an isolate of unknown origin and from which Old Sinhala borrowed various aspects into its main Indo-Aryan substrate), and the Maldivian language.