'Thorongil often counselled Ecthelion that the strength of the rebels in Umbar was a great peril to Gondor, and a threat to the fiefs of the south that would prove deadly, if Sauron moved to open war. At last he got leave of the Steward and gathered a small fleet, and he came to Umbar unlooked-for by night, and there burned a great part of the ships of the Corsairs. He himself overthrew the Captain of the Haven in battle upon the quays, and then he withdrew his fleet with small loss. But when they came back to Pelargir, to men's grief and wonder, he would not return to Minas Tirith, where great honour awaited him.
'He sent a message of farewell to Ecthelion, saying: "Other tasks now call me, lord, and much time and many perils must pass, ere I come again to Gondor, if that be my fate." Though none could guess what those tasks might be, nor what summons he had received, it was known whither he went. For he took. boat and crossed over Anduin, and there he said farewell to his companions and went on alone; and when he was last seen his face was towards the Mountains of Shadow.
There was dismay in the City at the departure of Thorongil, and to all men it seemed a great loss, unless it were to Denethor, the son of Ecthelion, a man now ripe for the Stewardship, to which after four years he succeeded on the death of his father.
'Denethor II was a proud man, tall, valiant, and more kingly than any man that had appeared in Condor for many lives of men; and he was wise also, and far-sighted, and learned in lore. Indeed he was as like to Thorongil as to one of nearest kin, and yet was ever placed second to the stranger in the hearts of men and the esteem of his father. At the time many thought that Thorongil had departed before his rival became his master, though indeed Thorongil had never himself vied with Denethor, nor held himself higher than the servant of his father. And in one matter only were their counsels to the Steward at variance: Thorongil often warned Ecthelion not to put trust in Saruman the White in Isengard, but to welcome rather Gandalf the Grey. But there was little love between Denethor and Gandalf; and after the days of Ecthelion there was less welcome for the Grey Pilgrim in Minas Tirith. Therefore later, when all was made clear, many believed that Denethor, who was subtle in mind and looked further and deeper than other men of his day, had discovered who this stranger Thorongil in truth was, and suspected that he and Mithrandir designed to supplant him.
'When Denethor became Steward (2984) he proved a masterful lord, holding the rule of all things in his own hand. He said little. He listened to counsel, and then followed his own mind. He had married late (2976), taking as wife Finduilas, daughter of Adrahil of Dot Amroth. She was a lady of great beauty and gentle heart, but before twelve years had passed she died. Denethor loved her, in his fashion, more dearly than any other, unless it were the elder of the sons that she bore him. But it seemed to men that she withered in the guarded city, as a flower of the seaward vales set upon a barren rock. The shadow in the east filled her with horror, and she turned her eyes ever south to the sea that she missed.
'After her death Denethor became more grim and silent than before, and would sit long alone in his tower deep in thought, foreseeing that the assault of Mordor would come in his time. It was afterwards believed that needing knowledge, but being proud, and trusting in his own strength of will, he dared to look in the
'In this way Denethor gained his great knowledge of things that passed in his realm, and far beyond his borders, at which men marvelled; but he bought the knowledge dearly, being aged before his time by his contest with the will of Sauron. Thus pride increased in Denethor together with despair, until he saw in all the deeds of that time only a single combat between the Lord of the White Tower and the Lord of the Barad-dur, and mistrusted all others who resisted Sauron, unless they served himself alone.