The Kingdom of Arnor was a realm in Middle-earth, established by the descendants of Isildur, one of the leaders of the Dúnedain. Founded in the Third Age, it was located in the northern part of Eriador, encompassing regions like Bree and Fornost. Arnor was known for its rich history and strong ties to the Kingdom of Gondor. Over time, Arnor faced internal strife and external threats, leading to its fragmentation into three smaller kingdoms: Arthedain, Cardolan, and Rhudaur. The kingdom eventually fell into decline, with the last king, Arwen's ancestor, ruling until its final collapse. Despite its fall, Arnor's legacy continued through its people and their enduring spirit.