Vidumavi
From Tolkien Gateway
Vidumavi (died Third Age 1344) is the daughter of Vidugavia, the King of Rhovanion. She married the Gondorian King Valacar when he was on a diplomatic mission in Rhovanion.
She was, as the Dúnedain of Gondor feared, shortlived (dying in 1344 of the Third Age, before Valacar became king), but she succeeded in bearing Valacar a son, the future King Eldacar. Because of Eldacar's short-lived, non-Dúnadan mother, many Gondorians were unwilling to accept him as king, leading to the disastrous Kin-strife.
She was also known by the name Galadwen.
