The Third Age saw the rise in power of the realms of Arnor and Gondor, and their fall. Arnor was divided into three petty Kingdoms, which fell one by one in the wars with Sauron's vassal kingdom of Angmar, whilst Gondor fell victim to Kin-strife, plague, Wainriders, and Corsairs. In this time, the line of the Kings of Gondor ends, with the House of the Stewards ruling in their stead. Meanwhile, the heirs of Isildur from the fallen kingdom of Arnor wander Middle-earth, aided only by Elrond in Rivendell; but the line of rightful heirs remains unbroken throughout the age.