Here's another indication of how Rostand's La Princesse Lointaine spread the Rudel legend more widely by influencing the visual arts. Besides the work by Mucha, Erté, and Vrubel, there were also illustrations by a famous-ish English artist.
George Sheringham (1884-1937) was best known as a stage designer, but he also illustrated books by the likes of Max Beerbohm, Arthur Conan Doyle, Cyrus MacMillan, and - it so happens - Edmond Rostand.

Sheringham was evidently well qualified to take on the Rudel legend: he spent the final five years of his life as an invalid, though not from pining for an idealised woman, lointaine or otherwise.
The edition sometimes comes up on rare book websites (from where I sourced most of the pics).