Locals speak of Saint George's
Castle as the cradle of their city, and it might have been
where the Portuguese capital began. Its occupation is
believed to have predated the Romans -- the hilltop was used
as a fortress to guard the Tagus and its settlement below.
Beginning in the 5th century A.D., the site was a visigothic
fortification; it fell to the Saracens in the early 8th
century. Many of the existing walls were erected during the
centuries of Moorish domination. The Moors held power until
1147, the year Afonso Henríques chased them out and extended
his kingdom south. Even before Lisbon became the capital of
the newly emerging nation, the site was used as a royal
palace.