The 1947 Campeonato de Selección y Competencia, the top category of Peruvian football at the time, was played by 8 teams. The national champion was Atlético Chalaco. Sporting Tabaco and Universitario de Deportes refused to play a relegation playoff. Hence no team was relegated and the first division grew to 9 teams for 1948.
1947 National Champions - 2nd title
References
1947 Peruvian Primera División Wikipedia(Text) CC BY-SA