Sikelgaita, duchess of Apulia (b. c. 1040)
Sikelgaita (also Sichelgaita or Sigelgaita) (1040 – 16 April 1090) was a Lombard princess, the daughter of Prince Guaimar IV of Salerno and second wife of Duke Robert Guiscard of Apulia. She commanded troops in her own right.