Around T.A. 1300, Sauron's shadow became stronger and evil things multiplied, heralded by the reappearance of the Nazgûl. The lord of the Nazgûl came north and established the realm of Angmar
he intended to destroy the Dúnedain of the North and to exploit the disunity of the splinter realms of Arthedain, Cardolan and Rhudaur. He gathered many evil men, Orcs and other fell creatures in Angmar and became known as the Witch-king of Angmar,Rhudaur was the first kingdom to fall. There were few Dúnedain in Rhudaur and an evil lord of the Hillmen, who had a secret alliance with Angmar, seized the power In T.A. 1409 a large army from Angmar invaded Cardolan and besieged Weathertop. The forces of Angmar defeated the Dúnedain, killed King Arveleg I and burned and destroyed the Tower of Amon Sûl, which stood on Weathertop During the reign of King Argeleb II most people of Cardolan, especially in Minhiriath died in the Great Plague, which brought an end to the Dúnedain of Cardolan. As a consequence, evil spirits from Angmar and Rhudaur occupied the deserted mounds In T.A. 1974 Angmar had recovered and invaded Arthedain from the north before the end of the winter. The Witch-king overran Arthedain and conquered Fornost before the end of the year and drove away most of the remaining Dúnedain over the river Lhûn, including the sons of the king. King Arvedui of Arthedain defended the North Downs as long as he could until he had to flee to the north with some of his guards on horses. Arvedui hid in tunnels of old dwarf-mines at the northern end of the Blue Mountains until his supplies ran out and then fled to a camp of the Lossoth at the southern shore of the Icebay of Forochel where he was forced to wait. The Elves of Lindon heard of the flight of Arvedui to the north and sent a ship to rescue Arvedui, but it sank shortly after picking up Arvedui in the bay of Forochel when the ship was driven back to the ice by a storm and was crushed by further ice that was piled up against it in March T.A. 1975
Witch-King of Angmar