The "Book of Lost Tales 2" contains a description of the 11 Houses of the Gondolindrim, known in canon only through Glorfindel of Gondolin of the House of the Golden Flower and Galdor of the Tree.

The House of the Fountain had silver and diamonds as their delight, and their swords were long, bright and pale. They went into battle to the music of flutes. Their leader was Ecthelion of the Fountain, who had the fairest voice and was most skilled in music of all the Gondolindrim.
Encyclopedia entry originally written by atalante_star