Terceira is one of the nine islands of the Azores , a member of the " Central Group " . Formerly known as " Island of Our Lord Jesus Christ of Terceiras " , being the administrative center of the Terceiras island's , it´s was designated as the Azores . The Terceira designation applied to the entire archipelago of the Azores as they were the third discovered in the Atlantic islands ( the archipelago of the Canary Islands was designated the First and Second by Madeira Islands , in the chronological order of discovery ) . With advancing years this island came to be known only by Terceira .
Throughout its history, Terceira played a major role in the establishment and maintenance of the Portuguese Empire , due to its geo-strategic location in the North Atlantic .