Arveleg was the eighth King of Arthedain. He took over power from his father due to Argeleb's untimely death in battle with the alliance between the realms of Angmar and Rhudaur.

Arveleg's reign was bookended by war and strife. He made a decision to ally himself with the people of Cardolan and with the Elves of Lindon and together they formed a front against Rhudaur and Angmar. These two forces came to a standstill, and remained that way for more than 50 years. During this time, Arthedain and Cardolan held a strong front along the Weather Hills, the Great Road, and lower River Hoarwell. Rivendell did not fall along this protected front though, and it is said that at some point during this time, it was besieged.

In TA 1409, a great host came down from Angmar , entered the lands of Cardolan and surrounded Weathertop. The Dúnedain were unable to hold back the assault, and in the battle for Amon Sûl, Arveleg I was slain. The enemy burned the tower and razed it to the ground, but the palantír was saved and borne away to Fornost. Rhudaur was then entirely occupied by evil Men from Angmar and the lands of Cardolan were ravaged.

Arveleg I reigned from TA 1356 until TA 1409. He was succeeded by his young son Araphor.