Since medieval times this was a trade and merchandise place but after the earthquake this area was designed as the city?s main marketplace surrounded by classical styled buildings. It remained as such until 1885 when a covered market was built (not so interesting as the Mercado da Ribeira). This market was demolished in the late 1940?s and gave place to an open space. Later on the 1970?s a bronze equestrian statue of King João I was added.
João I was an important Portuguese monarch -the first king of the second dynasty, known as the House of Aviz, after himself who was Master of the military Order of Aviz . The institution of House of Aviz followed the dynastic crisis that originated from the death of Fernando I (his half-brother) in 1383 without successors and the claim of the Portuguese throne by the Spanish king, Juan I de Castile. The people didn?t acclaim the Spanish king and acclaim for the first time someone out of the main lineage. In Portugal all kings had to be acclaimed by the people.
As the Spanish king shown reluctance with the people?s decision he invades Portugal in 1385 and entered into a battle in Aljubarrota (close to Leiria). João I choose as its constable Nuno Álvares Pereira who victory the decisive Battle of Aljubarrota (August 14, 1385), where the Castilian army (6 times bigger) was virtually annihilated due to the tactic used on the battle field.
To commemorate this victory João I promise to erect a monastery to thank the Virgin Mary -the monastery start in 1386 and it took 200 years to finish but becomes one of the jewels of the Portuguese architecture and UNESCO heritage -Mosteiro da Batalha (battle monastery) whose real name is Monastery of the Saint Mary of Victory.
On 11 February, 1387, João I married Philippa of Lancaster, daughter of John of Gaunt, who had proved to be a worthy ally, consolidating the Anglo-Portuguese Alliance that endures to the present day. This marriage was also quite fortunate as the progeny, known as the "Illustrious Generation" (Ínclita Geração) included Eduardo (future king), Peter (regent of the kingdom, not a VTEER but one of the most traveled princes of its time), Henrique or Henry the Navigator, who guided Portugal to the Great era of The Discoveries, Isabella who married Philip III of Burgundy, John, the grandfather of the two greatest Iberian monarchs in the 16th century, Manuel I of Portugal and Isabella I of Castile, and Fernando, "the Saint Prince," a warrior, who was captured during the Disaster of Tangier and died a prisoner of the Moors.
This period of Portuguese history is considered to include the ascension of Portugal to the status of a European and world power. The first act of expansion was the conquest of Ceuta in 1415 (under the commands of João I) and was followed by the exploration, colonization and commerce exercised in Africa, Asia and Brazil.
The statue of King João I is usually smothered by flocks of pigeons and surrounded by teenage skaters. In recent years there were some live concerts (they put a stage in the middle of the square) mostly during the summer times.
From this plaza we can get a very good view of the castle overlooking it. Try the view while you get a coffee and some pastries at the gold medal prize Confeitaria Nacional, considered to be one of Europe's most elegant pastry shops when it opened in 1829. The Confeitaria still serves some mouth-watering cakes among them the quite famous ?bolo-rei? (literally, King Cake) a traditional Portuguese soft dough cake with nuts and fruits, which is usually eaten around Christmas until the "Dia de Reis" (literally, Day of Kings, as a reference to the three wise men) on January 6th.
Along with the underground car parking, most of Lisbon?s buses and trams stop at the square which shares with Rossio square the metro station ?Rossio? (green line) .

