Rosamund Clifford (before 1150 – c. 1176), often called "The Fair Rosamund" or the "Rose of the World", was famed for her beauty and was a mistress of King Henry II of England, famous in English folklore.
Rosamund is believed to have been the daughter of the marcher lord Walter de Clifford and his wife Margaret. Walter was originally known as Walter fitz Richard (i.e. son of Richard), but his name was gradually changed to that of his major holding, first as steward, then as lord. This was Clifford Castle on the River Wye in Herefordshire. Rosamund had two sisters, Amice and Lucy. Amice married Osbern fitz Hugh of Richard's Castle, Herefordshire, and Lucy, Hugh de Say of Stokesay, Shropshire. She also had three brothers, Walter de Clifford (died 1221), Richard and Gilbert. Her name, "Rosamund", may have been influenced by the Latin phrase rosa mundi, which means "rose of the world."
Rosamund grew up at Castle Clifford, before going to Godstow Nunnery, near Oxford, to be educated by the nuns. Henry publicly acknowledged the liaison with Rosamund in 1174. When the affair ended, Rosamund retired to Godstow Abbey, where she died, not thirty years old, in 1176. According to Mike Ibeji, "there is ...no doubt that the great love of his life was Rosamund Clifford."
The traditional story recounts that King Henry adopted her as his mistress. To conceal his illicit amours from his Queen, Eleanor of Aquitaine, he conducted them within the innermost recesses of a complicated maze which he caused to be made in his park at , Oxfordshire. Rumours having reached the ears of Queen Eleanor, the indignant lady contrived to penetrate the labyrinth, confronted her terrified and tearful rival, and forced her to choose between the dagger and the bowl of poison; Rosamund chose the latter and died.