Covilhã () is a city and a municipality in the Centro region, Portugal. The city proper had 33,691 inhabitants in 2021. The municipality population in 2021 was 46,455 in an area of . It is located in the Beiras e Serra da Estrela subregion and Beiras and Serra da Estrela Intermunicipal Community. The municipal holiday is October 20. Sometimes referred to as town of wool and snow, Covilhã is one of the main urban centres of the historical Beira Interior region. The proximity of the mountains offers dramatic scenery and a great environment for those fond of hiking, camping, mountain climbing and skiing. With an industrial tradition historically focused on textile industry supplied by an abundance of wool produced in the area since antiquity, but with a more diversified industry in contemporaneity, Covilhã, which was once known as the "Portuguese Manchester", is also a university city nowadays awarding degrees from aeronautical engineering to medicine to philosophy. History Covilhã's history dates back to the days when it was a pre-historical settlement, a shelter for Lusitanian shepherds, and a Roman fortress known as Cava Juliana or Silia Hermínia. The region of Beira Interior, where the city of Covilhã is located, is rich in historical places. Due to its strategic potential, its mountains were used to build castles for both attack and defence purposes. Covilhã was granted foral in 1186 by king Sancho I of Portugal, who also built the castle walls. And, later, it was king Denis of Portugal who ordered the construction of the walls of the admirable medieval district of Portas do Sol. The old quarters of the city have narrow cobblestone streets; pedestrians are challenged permanently by the ups and downs of most of the streets in the city. It was already in the Middle Ages one of the main "villages of the kingdom", a situation later confirmed by the fact that great natives from the city or its surroundings became decisive in all the great Portuguese Discoveries of the 15th and 16th centuries: the advance in the Atlantic Ocean, the sea route to India, the discoveries of America and Brazil, the first circumnavigation of the Earth. In full population expansion when the Renaissance appeared, the economic sector was particularly important in agriculture, pastoralism, fruit-growing, and forestry. Trade and industry were booming. Gil Vicente cites "the many fine cloths". The Infante D. Henrique, knowing this reality well, became "lord"