The Peruvian Liga 1, also known as the Primera División, is the top professional soccer league in Peru. It was established in 1912, making it one of the oldest leagues in South America. The league consists of 20 teams, which compete in a round-robin format over the course of a season. The most successful team in Liga 1 history is Universitario de Deportes, with 26 league titles to their name. Another notable team is Alianza Lima, who have won the league 23 times. An interesting fact about the league is that it has a strong rivalry between Universitario de Deportes and Alianza Lima, known as the "Clásico del Fútbol Peruano."