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36 m/118 ft.
History
The ancient settlement, probably of pre-Roman origin, was known as Cale and later Portus Cale. It was captured by the Moors in AD 716 and retaken by the Christians in 1092; the town received its charter in 1115. It initially developed as a trading post with the Mediterranean area and was located on an important route linking Lisbon and Braga. The city itself was fortified by the Romans, and these walls were later reinforced in the 12th century. Maritime and commercial activities increased between the 13th and 15th centuries and a shipyard, one of the most important in Portugal, was established. Porto's outer, artificial harbour, constructed in 1890, helped spur the city's growth further.
Yellow and the diamond shape represent Brazil's mineral wealth. The motto Ordem e Progresso means ‘Order and Progress’. Green stands for the vast forests. Effective date: 15 November 1889.
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