Sancho I of Portugal
Cantiga da Ribeirinha (also known as "Cantiga da Garvaia" or "Cantiga da Guarvaia") is one of the first known pieces of literature in Galician-Portuguese. The poem's date of composition is debated, with some experts placing it in 1189 or 1198, and others claiming it could not have been written before 1200. It was composed by Paio Soares de Taveirós and received its name because it was dedicated to Maria Pais Ribeira, the mistress of Sancho I of Portugal, known as "Ribeirinha."