Please answer a question about the following article about Portugal:

Portuguese cinema has a long tradition, reaching back to the birth of the medium in the late 19th century. Portuguese film directors such as Arthur Duarte, António Lopes Ribeiro, António Reis, Pedro Costa, Manoel de Oliveira, João César Monteiro, António-Pedro Vasconcelos, Fernando Lopes, João Botelho and Leonel Vieira, are among those that gained notability. Noted Portuguese film actors include Joaquim de Almeida, Daniela Ruah, Maria de Medeiros, Diogo Infante, Soraia Chaves, Ribeirinho, Lúcia Moniz, and Diogo Morgado.

In which period was cinema born?
late 19th century