Imrahil's father was Prince Adrahil. Imrahil's
Imrahil, ruling prince of Dol Amroth, is spoken of in the Lord of the Rings as Denethor's and Faramir's kinsman, as Denethor's wife, Finduilas, was his sister.
Dol Amroth was named after Lothlorien's elf-king, Amroth, he who loved Nimrodel. Amroth, valiant and wise, kept his small kingdom fair and prosperous. Until Amroth's drowning in 1981 TA when he leaped off of what he thought was the last ship to the West, this was the seaport city from which the elves of Lothlorien sailed to Valinor in white swan ships that could navigate straight space. For this reason, the gilded banners of the princes of Dol Amroth were blue as the sea, marked with a white ship and the silver swan of Ulmo. Dol Amroth was one of the five great cities of Gondor, in the fief of Belfalas, ruled by princes. The tower of Dol Amroth was called the Sea-ward Tower, Tirith Aear in the Sindarin language. The Sindarin word "dol" meant "hill" or "hill of".
Imrahil showed both his Dunadan and elvish history in looks, learning, and manners. He and his folk were tall with sea-grey eyes and dark hair, of "high blood", carrying themselves proudly. They sang as they came into Gondor.
When it is said they are from the people of Nimrodel, the reference is to the silvan elves, their blood mingled with Noldorins who had fled Eregion due to Sauron. The silvan elves were Teleri who never reached the Sea on the westward march when called to Valinor. King Amroth, son of King Amdir, was a golden-haired Sindarin elf, as the normal arrangement in Lothlorien was to have Sindarin rulers over silvans. This arrangement was the same as in Mirkwood, where the golden-haired Sindarin King Thranduil, whose son was Legolas of the Fellowship, ruled the silvan elves. If Amroth had had a daughter, she might very well have been matched to Thranduil's son. After King Amroth's death without an heir of any sort, Celeborn and Galadriel's return was welcomed by the people, and the pair took up guardianship rather than rulership of Lothlorien. Part of the welcome may have been that Celeborn continued the familiar tradition of Sindarin leadership, being Sindarin. Galadriel, his wife and advisor, was a golden-haired full Noldorin. Galadriel knew that, to keep Sauron from crossing the River Anduin, the area required strong leadership which was missing after the death of Amroth.
The legend of Prince Imrahil's line (from Unfinished Tales) says that Nimrodel and her maidens fled the evil arising in Moria and became lost in the wooded hills, therefore not reaching Dol Amroth in time to sail with Amroth. Mithrellas apparently became separated from this little group and was harbored by Imrazor the Numenorean, who lived in Belfalas, and he took her to wife. They had a son, Galador, and a daughter, Gilmith. Then Mithrellas slipped away one night and Imrazor never saw her again. Galador became first Lord of Dol Amroth. Apparently this was not love or even desired as long term (at least by the lady), and therefore Mithrellas did not seem to have been required to make the choice of Luthien and Arwen for mortality. As a full elf, she could not have been allowed that choice in any case and would have been aware of the fact from the beginning.
Prince Angelimar was twentieth in unbroken descent from this same Galador, and fathered Adrahil who fathered Imrahil. Amdir may also have been called Malgalad and Adrahil.
A small settlement of elves lived near the larger human city of Dol Amroth.
On the Dunadan side of Prince Imrahil's ancestry, a group of the Faithful from Numenor related to Elendil from whom comes the title of Prince, sailed away before the Downfall, settling in Belfalas with a stronghold on the high promontory of Dol Amroth. Apparently the name of the promontory much later became the name of the city, castle, and port as well, possibly at the time of Galador. Perhaps he brought it all together and this is why he was called the first Lord of Dol Amroth.
At the time of the War of the Ring, Prince Imrahil brought his men from Dol Amroth to aid in the defense of Gondor: a company of swan-knights on grey horses, with seven-hundred men at arms.
Prince Imrahil proved great bravery going foremost with his men in Denethor's sortie, following Gandalf the White, against the flying Nazgul and his great army that had harried Faramir's forces back from the defense of Osgiliath to the gates of Gondor. The charge of Dol Amroth saved Faramir from being hewn to pieces after being felled by a poisoned Southron dart (arrow). Imrahil collected what could have been Faramir's dead body from the field, apparently recognized that he was alive, removed the arrow and stanched the wound. Then Imrahil took him across his horse to the White Tower to Denethor.
He supported Gandalf when he took command of Gondor, after Denethor despaired. (For after Faramir's fall, Denethor looked into the palantir, seeing only what Sauron wanted him to see, and believed their hope was lost. He despaired and, unknown to Imrahil, planned to suicide, taking his feverish son into the pyre with him.) But Gandalf was pulled away from command of Gondor's forces to handle this madness, leaving Prince Imrahil as their leader.
Thus, as commander, Prince Imrahil was in the van of Gondor meeting the men of Rohan with Theoden's body, over whom he wept. Attracted by Eowyn's beauty to look more closely, he recognized that she still lived, proving to them that she breathed by using as a mirror his polished vambrace (forearm armor). Thus she went to the Halls of Healing, saving her life. Thus at least twice Imrahil shows knowledge of healing
From the meeting with with the wounded Rohirrim, Imrahil and the others from Gondor rode into the battle aiding the breaking charge of the new king of Rohan, Eomer, against the forces rallied by Gothmog, lieutenant of Morgul. The prince was one of the very few able to survive that battle unscathed, along with Eomer and Aragorn, who came with his Corsair fleet reinforcements.
Understanding rulership, being a relative, and being in the neighborhood, it was natural for Prince Imrahil to step in for the Stewardship of Gondor when Aragorn had not yet claimed the throne, Denethor had killed himself, Boromir had earlier been killed by orcs, and Faramir was in the Houses of Healing. Imrahil's banner flew for a time from the White Tower.
Legolas came to Imrahil with a message from Aragorn, who desired his and Eomer's presence at his tents along with Gandalf, Elladan, and Elrohir for a council. Legolas immediately recognized that the prince had the blood of the people of Nimrodel, and said so. Imrahil agreed that it was in the lore of his land, but no elf had been seen there for "years beyond count". To Gimli, Legolas afterwards commented that Imrahil was "a fair lord and a great captain of men".
Once Faramir was well enough to take up Stewardship in the newly crowned Aragorn's name, Prince Imrahil was free to go, and joined Aragorn as one of the Captains of the West before the Gate of Morannon.
There they were in the deadly position of distracting Sauron, causing him to send out his forces early and away from Frodo and the Ring. Pippin and Beregond stood on the same hill as the Prince and the other men of Gondor. The Captains of the West were joined by the Eagles racing towards the Nazgul, as massive forces swept against the defenders' hills. But just as the eagles came, the the Dark Lord abruptly had more important business, as the Ring was revealed on Mt. Orodruin. So the Dark Lord's will suddenly loosed from his servants, to their confusion, and as the Ring melted, his works broke apart and great tumult of destruction ended the battle.
Prince Imrahil's daughter, Lothiriel, married Eomer, King of Rohan.
References: Lord of the Rings, Silmarillion, Unfinished
Imrahil tends to his nephew, Faramir. Artist Anke-Katrin Eiszmann.