Question: What is the date of death of Robert Scalio's mother?
Sentence (from "Sikelgaita"): Sikelgaita (also "Sichelgaita" or "Sigelgaita") (1040 – 16 April 1090) was a Lombard princess, the daughter of Guaimar IV, Prince of Salerno, and second wife of Robert Guiscard, Duke of Apulia.
Relevant evidence: Yes