Lusitania (Portuguese: Lusitânia, Spanish: Lusitania) or Hispania Lusitania was an ancient Roman province including approximately all of modern Portugal south of the Douro river and part of modern Spain (the present autonomous community of Extremadura and a small part of the province of Salamanca). It was named after the Lusitani or Lusitanian people (an Indo-European people). Its capital was Emerita Augusta (currently Mérida, Spain), and it was initially part of the Roman Republic province of Hispania Ulterior, before becoming a province of its own in the Roman Empire. Romans first came to the territory around the mid 2nd century BC. A war with Lusitanian tribes followed, from 155 to 139 BC. In 27 BC, the province was created.
Read more about Lusitania: Origin of The Name, Lusitanians, War Against Rome, Notable Lusitanians, Portuguese Use of The Name