Middle-earth heraldry: Ecthelion (Fountain)

Gondolin had long been a hidden city, heavily fortified and cut off from the Noldor's allies and enemies alike. The Elf Maeglin, a lord of Gondolin, resented both Turgon and Tuor, primarily because of the latter's marriage to Idril, whom he desired as a lover. After an argument, he set out from Gondolin into the mountains, searching for ore. Orcs captured him, and he pleaded with and bribed them to bring him to Morgoth rather than kill or torture him. Morgoth recognized him, and told him he would make Maeglin ruler of Gondolin and husband of Idril if he betrayed them and gave Morgoth information on how to gain access to the city. Maeglin agreed to the treachery, and was given a token by Morgoth that would supposedly protect his life during the assault. Maeglin returned to the city and spoke nothing of his capture. Idril noticed a change in him however, and sensing danger she began working on Idril's secret way, a hidden passage deep beneath Gondolin that would later act as an escape route. Lastly, Maeglin began to convince some of the weaker lords, such as Salgant, to his side, thought not disclosing his allegiance to Morgoth.

• House of the King: Turgon was their lord. They wore red white and gold, and their insignia was a sun, moon, and heart.
• House of the Heavenly Arch: Lead by Egalmoth, this was the richest house. They wore opals, and their shields were blue with a jewel made up of seven different colored gems.
• House of the Tree: Galdor was their lord. They were great scouts, and carried slingshots or studded clubs, and wore green.
• House of the Golden Flower: Glorfindel’s house, they wore a golden rayed sun on their shields.
• House of the Fountain: Ecthelion’s house, they were especially fond of silver and diamonds.
• House of the Swallow: Lead by Duilin, this was a house of archers. They wore feathers on their helmets and dressed in dark blue, purple, and black. An arrowhead was their emblem.
• House of the Harp: Salgant was their lord, though he tried to betray the city. Their shields had a silver harp on a black background.
• House of the Mole: Lead by Maeglin, most of the members of this house worked in the quarries or with ore, and many of them supported Maeglin during the Fall of Gondolin. They wore black.
• House of the Pillar: Penlod was their lord, and they wore a white pillar on a red background.
• House of the Tower of Snow: Also lead by Penlod.
• House of the Wing: The smallest house, lead by Tuor. They wore swan wings on their helmets and had a wing emblem on their shield.
• House of the Hammer of Wrath: Lead by Rog, this house was mainly smiths and craftsmen. In battle they carried heavy maces, and their shields were red with a black hammer and anvil.

SOURCES: History of Middle Earth v. 2 - The Book of Lost Tales Part 2 (“The Fall of Gondolin”)