The Portuguese Primera Liga, also known as Liga NOS, is the top professional soccer league in Portugal. It was established in 1934 and is one of the oldest leagues in Europe. The league consists of 18 teams that compete for the title each season. Benfica and Porto are the most successful teams in the league's history, with both clubs winning numerous titles. An interesting fact about the league is that it has produced some of the world's finest players, including Cristiano Ronaldo and Luis Figo.