He moved his summer residence from the capital city of Osgiliath to the fortress of Minas Anor in TA 420. During this time he rebuilt and greatly added to it and over time it would become a city as well as a fortress, until after the Great Plague of 1636 when it became the capital of Gondor as Minas Tirith, over twelve-hundred years later.
In the last two years of his reign the Easterlings started attacks on Gondor. He sent his son Tarostar (later known as Rómendacil I) to meet the Easterling threat and Tarostar forced the Easterling into submission.
Ostoher died in TA 492 at the age of two-hundred seventy after a rule of eighty-one years and was succeeded by Tarostar.
|Kings of Gondor|
Elendil | Isildur | Meneldil | Cemendur | Eärendil | Anardil | Ostoher | Rómendacil I | Turambar | Atanatar I | Siriondil | Tarannon Falastur | Eärnil I | Ciryandil | Hyarmendacil I | Atanatar II Alcarin | Narmacil I | Calmacil | Rómendacil II | Valacar | Eldacar | Castamir the Usurper | Eldacar (restored) | Aldamir | Hyarmendacil II | Minardil | Telemnar | Tarondor | Telumehtar Umbardacil | Narmacil II | Calimehtar | Ondoher | Eärnil II | Eärnur | Aragorn II Elessar | Eldarion