EILDON HILLS, three conical volcanic hills in Roxburgh shire, Scotland, i m. S. by E. of Melrose. They were once known as Eldune—the Eldunum of Simeon of Durham (fl. probably from the Gaelic aill, "rock," and dun, "hill" ; or a cor ruption of the Cymric moeldun, "bald hill." The northern peak is 1,327 ft. high, the central 1,385 ft. and the southern 1,216 ft. According to General William Roy (1726-179o) the Roman station of Trimontium—so called, according to this theory, from the triple Eildon heights—was Old Melrose ; other authorities incline to place the station on the northern shore of Solway Firth. The Eildons have been the subject of much legendary lore. The Eildon Tree Stone, a large moss-covered boulder, lying on the high road as it bends towards the west within 2 m. of Melrose, marks the spot where the Fairy Queen led Thomas of Erceldoune into her realms in the heart of the hills.