Vidumavi
Princess Vidumavi of Rhovanion was the daughter of King Vidugavia, and became the Princess of Gondor as well, through her marriage to Prince Valacar.
To strengthen the bond between Gondor and the Northmen (Later to become the Rohirrim), King Rómendacil II brought many of Vidumavi's people into his service, and showed especial favour to her father, King Vidugavia of Rhovanion. Rómendacil II sent his son Valacar to live with Vidugavia as the ambassador of Gondor, to learn the language and culture of the Northmen.
Vidumavi was fair, noble, courageous and beautiful, and Valacar fell in love with her. They married and had a son, Prince Eldacar, named "Vinitharya" by the Northmen. The family returned to Gondor in TA 1260, but their marriage and heir were not well received by many of the lords of Gondor, who thought ill of the mixing of blood in the royal line.
In her later life, Princess Vidumavi's son Eldacar himself had two sons, Princes Ornendil and Aldamir.
As a Northman, Vidumadi had a much shorter life span than the former Númenórean were used to, and she died of old age in TA 1332, while Rómendacil II was still the king. This sowed the seeds of the Kin-strife in Gondor, as some of the Lords worried the life span of the line of Kings would diminish similarly.