 The population of most of the Hittite Empire by this time spoke Luwian, another Indo-European language of the Anatolian family that had originated to the west of the Hittite region.According to Craig Melchert, the current tendency is to suppose that Proto-Indo-European evolved, and that the "prehistoric speakers" of Anatolian became isolated "from the rest of the PIE speech community, so as not to share in some common innovations.