In the 9th Century, Águeda was a prosperous borough, with stable commerce and an active port that supported local and regional businesses. It was mentioned in documents from 1050 to 1077, by its primitive name "Casal Lousado" (), or by its anglicized forms: "Anegia", "Agatha" and "Ágada"; by the 9th Century, this settlement was referred to as "Ágata". In a document dated 1050, there is mention of several villages situated within the current borders, many with names originating from Arab languages.