Portuguese literature is, generally speaking, literature written in the Portuguese language, particularly by citizens of Portugal; it may also refer to literature written by people living in Portugal, Brazil, Angola and Mozambique, as well as other Portuguese-speaking countries. An early example of Portuguese literature is the tradition of a medieval Galician-Portuguese poetry, originally developed in Galicia and northern Portugal. The literature of Portugal is distinguished by a wealth and variety of lyric poetry, which has characterized it from the beginning of its language, after the Roman occupation; by its wealth of historical writing documenting Portugal's rulers, conquests, and expansion; by the then considered Golden Age of the Renaissance period of which it forms part the moral and allegorical Renaissance drama of Gil Vicente, Bernardim Ribeiro, Sá de Miranda and especially the great 16th-century national epic of Luís de Camões, author of national and epic poem "Os Lusíadas" (The Lusiads).