Centre for Lusophone and European Literatures and Cultures Portugal, being home for more than 500 researchers, and the research unit with more young researchers in projects and positions of responsibility. Due to its established protocols, CLEPUL is part of an institutional network of cooperation for research in several areas of literary science and history of culture, including Portuguese institutions in Lisbon, Porto, Algarve and the Atlantic Islands, namely Madeira, and international institutions, such as in Australia and Canada, while keeping privileged relations with Lusophone countries, namely Brazil, Angola, Mozambique, Cape Verde, São Tomé and Príncipe and Guinea-Bissau. CLEPUL currently publishes six periodicals, to disseminate its scientific research results:
Proto-Indo-European language concerning PIE since there is no written record of the language. PIE is estimated to have been spoken as a single language from 4500 BC to 2500 BC during the Late Neolithic to Early Bronze Age, though estimates vary by more than a thousand years. According to the prevailing Kurgan hypothesis, the original homeland of the Proto-Indo-Europeans may have been in the Pontic–Caspian steppe of Eastern Europe. The linguistic reconstruction of PIE has also provided insight into the culture and religion of its speakers. As Proto-Indo-Europeans became isolated from each other through the Indo-European migrations, the Proto-Indo-European language became spoken