The square was the location of many historical events in São Paulo's history, most notably during the Diretas Já movement.Originally known as Largo da Sé (Field of the See), the square developed around the religious building which preceded the cathedral and surrounding edifices.The current landscape is the result of a 1970s project by architects led by José Eduardo de Assis Lefèvre.The architects were heavily influenced by contemporary landscaping works underway on the US's west coast (such as those by Lawrence Halprin), characterized by rigorous geometry, through multiple levels with reflecting pools and prism-like land masses.The square underwent a significant revitalization during 2006, having been partially re-inaugurated on January 25, 2007 (the city's anniversary) by then-mayor Gilberto Kassab.
Marco Zero
, in the square, is considered the official central point of São Paulo.