The Amoreira Aqueduct is a 16th-century aqueduct (begun in 1537) that spans the Portuguese municipality of Elvas, bringing water into the fortified seat. By around 1498, the only fountain and source of potable water since the Moorish occupation had been the Poço de Alcalá, alongside the Porta do Bispo. As the well had already begun drying-up, and owing to the difficulty of gathering water from the wells surrounding the town, King D. Manuel authorized a tax (the Real de Água) to fix the Poço de Alcalá. Yet, the attempts did not meet with success, and an idea developed to collect water from Amoreira, some 8 kilometres (5.0 mi) away. Consequently, in 1529 the first works to build the aqueduct were begun. In 1537, then King John III intervened by sending architect Francisco de Arruda to Elvas, to make changes to the primitive plan. Owing to the lack of funds for such a project, the King then authorized the diversion of monies from fines and sales associated with the sale of municipal lands for the project, including some loans from the children's orphanages in Elves and Estremoz.