<Dl> <Dt> Other </Dt> </Dl> <Ul> <Li> Proto - Anatolian </Li> <Li> Proto - Armenian </Li> <Li> Proto - Germanic (Proto - Norse) </Li> <Li> Proto - Celtic </Li> <Li> Proto - Italic </Li> <Li> Proto - Greek </Li> <Li> Proto - Balto - Slavic (Proto - Slavic) </Li> <Li> Proto - Indo - Iranian (Proto - Iranian) </Li> </Ul> <Li> Proto - Anatolian </Li> <Li> Proto - Armenian </Li>

What do recent archaeological discoveries of graves from the hittite kingdom reveal