Hyarmendacil I is a fictional character in J. R. R. Tolkiens universe of Middle-earth. He was the fifteenth King of Gondor from 1015 T.A. until 1149 T.A. His father Ciryandil was slain defending Umbar while besieged.
His original name was Ciryaher. He was the fourth and last Ship-king.
Ciryaher began his reign reorganizing Gondor's armies and in 1050 T.A. he openly declared war on the Haradrim and defeated them. The Haradrim were forced to recognize him as their lord and king. After this victory he called himself Hyarmendacil, meaning South-victor.
Under his reign Gondor reached its greatest extent and power. The passes of Mordor were well guarded, so evil found no chance in Hyarmendacil's reign. No one dared to contest his power and Gondor was at peace for the rest of his long reign of 134 years.
Given the name Ciryaher at birth, he suceeded to the throne after his father, Ciryandil, was slain during the Seige of Umbar, TA 1015.
Ciryaher spent the early years of his reign building up his power, until in TA 1050 he fell upon the Haradrim by sea and land defeating them utterly.
So great was Ciryaher's victory that the Kings of Harad acknowledged his lordship, and Ciryaher took the name Hyarmendacil which signifies 'South-victor'.