English, Spanish, Russian and Hindi, just to take four common examples, are languages that can be derived from a common ancestor. This ancestor is usually called Proto-Indo-European (PIE). The web pages collected in this category are concerned with one or several aspects of the study of PIE. This is a multi-disciplinary area. Linguists are interested in the reconstructed phonology, grammar and vocabulary of PIE. Archaeologists and historians debate the question of where and when PIE was spoken, and which archaeological culture can be identified with its speakers. Finally, ethnographers and scholars of comparative religion wonder about the culture and religion of these speakers, as reconstructable from the myths and religions of known Indo-European-speaking peoples, and from the archaeological sites associated with them.