Which architect designed the famous cathedral in Brasilia?

In 1956, Juscelino Kubitschek, newly elected Brazilian president, visited Niemeyer: ‘I am going to build a new capital for this country and I want you to help me’. Niemeyer organized a competition for the lay-out of Brasília, the new capital, and the winner was the project of his old master and great friend, Lúcio Costa. Niemeyer would design the buildings, Lucio the plan of the city.