Proto-Hmong–Mien (Chinese: 原始苗瑶语) is the reconstructed ancestor of the Hmong–Mien languages. Lower-level reconstructions include Proto-Hmongic and Proto-Mienic. The date of proto-Hmong-Mien has been estimated to be about 2500 BP by Sagart, Blench, and Sanchez-Mazas. It has been estimated to about 4243 BP by the Automated Similarity Judgment Program (ASJP), however, ASJP is not widely accepted among historical linguists as an adequate method to establish or evaluate relationships between language families.