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The East Road was a road which ran through the Shire.
The Great East Road was originally laid by the Dwarves probably during the First Age[source?], and ran from the Iron Hills through Rhovanion to Khazad-dûm, from which it continued across Eriador to the Blue Mountains, and then on into Kingdom of Doriath in Beleriand.
The western parts were built to facilitate the passage of companies of Dwarf craftsmen (and later, their armed escort) across eastern Beleriand, before the sack of Doriath by the dwarves of Nogrod ended their trade.
After the First Age of Sun, and the ruination of Nogrod and neighbouring Belegost, focus shifted to the eastern part of the ancient road, which had been built by the dwarves of Khazad-dûm in the Misty Mountains. Khazad-dûm's inhabitants, the Longbeard Dwarves, continued to grow in power and influence, and their trading needs meant that the road from the Iron Hills that travelled through Mirkwood to their gates became widely known. On the western side of the Misty Mountains, after traversing the High Pass, the road continued to the Blue Mountains, and this part ultimately became known as the Men-i-Naugrim or "Old Dwarf Road".
When the Númenórean realm-in-exile of Arnor was founded, the Arnorians took over the maintenance of the Men-i-Naugrim, and built several fortresses on or near it (including Weathertop), and expanded or created bridges over the rivers Brandywine and Hoarwell. After Arnor was divided in Third Age 861, the Great East Road formed the boundary between two of its successor states, Cardolan and Rhudaur.
By the time of the War of the Ring in the late Third Age, where the Great East Road met the Greenway lay the ancient village of Bree. A days ride east lay The Forsaken Inn, beyond which lay Rivendell. West of the crossroads the Hobbits had colonized the Shire, and their most important towns lay athwart the East Road; (Hobbiton and Michel Delving to name two).