Éowyn - King Théoden's niece and Éomer's sister.

"The woman turned and went slowly into the house.  As she passed the doors she turned and looked back.  Grave and thoughtful was her glance, as she looked on the king with cool pity in her eyes.  Very fair was her face, and her long hair was like a river of gold.  Slender and tall she was in her white robe girt with silver; but strong she seemed and stern as steel, a daugher of kings.  Thus Aragorn for the first time in the full light of day beheld Éowyn, Lady of Rohan, and thought her fair, fair and cold, like a morning of pale spring that is not yet come to womanhood.  And she now was suddenly aware of him: tall heir of kings, wise with many winters, greycloaked, hiding a power that yet she felt.  For a moment still as stone she stood, then turning swiftly she was gone." ~The Two Towers, Book III, chap. 6 (The King of the Golden Hall)