Pablo de Sarasate y Navascués (Pamplona 1844 – Biarritz 1908), was one of the most famous violinists of his time. He was also a magnificent composer. Like Paganini and Kreisler, Sarasate wrote mainly violin pieces which he himself played. Below are the available pieces by Sarasate.
Here also is a link to another violin piece by Sarasate, transcribed for cello by David Johnstone at johnstone-music.com. This is a virtuoso piece even for violin, and is presented here for cello in the original key, which makes it doubly virtuosic on the cello (and on a whole different playing level to the above transcriptions). On a difficulty level of 1-10, the hardest passages would certainly qualify as at least 9.5!