Doriath
Doriath, the Hidden Kingdom of King Thingol Grey-cloak in the First Age, was the greatest and most enduring of the Sindarin realms in Beleriand. Protected for long ages by the magical Girdle of Melian, a power that prevented any from entering against the Queen's will, it was a land of deep forests and twilight glades, the heart of Elvendom in Middle-earth before the rising of the Sun. Within its borders lay the Thousand Caves of Menegroth, the royal seat carved from the living rock by the Dwarves of the Blue Mountains, a place of unparalleled beauty and wisdom. It was here that the central tragedy and triumph of the Elder Days unfolded: the love of the mortal Beren and the immortal Lúthien Tinúviel, Thingol's daughter, a tale that would shape the fate of Elves and Men for ages to come.
The Realm of Thingol and Melian
Doriath was the domain of Thingol, the King of the Grey-elves, and his Queen, Melian, a Maia of great power. Their union was the only known marriage between an Elf and one of the divine order of the Valar. The Girdle of Melian, an invisible wall of enchantment, kept the realm safe from the wars of Morgoth for centuries, allowing the Sindar to prosper in peace while the rest of Beleriand burned. The capital, Menegroth, was a wonder of the ancient world, its halls and chambers carved into a hill beside the River Esgalduin, adorned with the finest works of Dwarven and Elven craft. It was a place of song and lore, where the minstrel Daeron devised the Cirth, the runes that would later be used by the Dwarves of Moria.
The Quest of the Silmaril
The peace of Doriath was shattered by the arrival of Beren, son of Barahir, a mortal Man of the House of Bëor. He fell in love with Lúthien, the fairest maiden ever to walk the earth, whose beauty was likened to the stars above the mists of the North. Thingol, scornful of mortal Men, set an impossible bride-price: Beren must bring him a Silmaril from the Iron Crown of Morgoth himself. This quest led Beren and Lúthien through unimaginable perils, including the dungeons of Sauron in his fortress of Tol-in-Gaurhoth, from which Lúthien rescued him. Together, they entered Angband, and Beren, with Lúthien's aid, cut a single Silmaril from Morgoth's crown. The quest was successful, but Beren was slain by the Wolf of Angband, Carcharoth, who swallowed the jewel. Lúthien, choosing mortality, followed Beren beyond death, and they returned to life for a brief time, dwelling in Doriath before passing from the world forever.
The Ruin of the Kingdom
The Silmaril brought no peace to Doriath. Its beauty and power awakened a curse of greed and oath. The Dwarves of Nogrod, who had been commissioned to set the jewel in a necklace, murdered Thingol and stole the Silmaril. Melian, in her grief, departed from Middle-earth, and the Girdle of Melian was lifted, leaving Doriath defenseless. The kingdom was then ravaged by the Dwarves, and later by the Sons of Fëanor, who were bound by a terrible oath to reclaim the Silmaril. Dior, the son of Beren and Lúthien and heir to Thingol, briefly restored the kingdom, but he was slain in a second attack by the Sons of Fëanor. The realm was utterly destroyed, its people scattered or slain, and the once-glorious Hidden Kingdom passed into memory and legend, a symbol of the beauty and sorrow of the Elder Days that were lost forever.