The Northern Rangers, also known as the Rangers of the North, were the northern wandering people of Eriador, the last remnant of the Dúnedain of Arnor who had once peopled the North Kingdom of Arnor. They protected the lands they wandered although their secretiveness made other peoples consider them dangerous and distrustful in Bree and the Shire, where they were known as "Watchers".
Breaking of ArnorEdit
The Dúnedain of the North dwindled after the breaking of Arnor into three kingdoms and the wars with Angmar. Cardolan and Rhudaur soon fell and only the petty-kingdom of Arthedain maintained the noble line of Isildur. Finally, that too was destroyed in the Battle of Fornost and Arvedui, the last King of Arthedain was lost in the sea.
Arvedui's son and heir, Aranarth claimed the title of the Chieftain, who would rule the remnants of his people. Elrond had in his keeping the heirlooms of the house of Isildur: the shards of Narsil, the Star of Elendil, the Sceptre of Annúminas and later the Ring of Barahir, ransomed from the Lossoth.
Each of Aranarth's heirs (who, like him, could trace his descent back to Isildur himself) would be secretly born and raised in Rivendell.