Siona retired from public life after Idaho's death and lived quietly on Arrakis, producing one book, The Las! Days, but otherwise calling little attention to herself. She was 255 years old when she died. C.T. Further references: ATREIDES, LETO H; ATRDEIDES, MONEO, IBN FUAD AL-LICHNA; IDAHO, DUNCAN; NAYLAJ STOLEN JOURNALS; Siona Atreides, The Last Days, Arrakis Studies 218 (Grumraan: United Worlds) ATREIDES-CORRINO. PRINCESS IRGLAN (10165-10248). Eldest daughter of Padishah Emperor Shaddam IV and Anuril Corrino; wife of Emperor Paul Muad'Dib Atreides; author and editor of numerous historical works; object of veneration as St. Irulan the Virgin. As daughter to the emperor, Irulan was trained in the nuances and die obligations of command. As a Bene Gesserit she received additional training in techniques of observation, memory and self-control. However, suffering from peer pressures and her own intellectual inadequacies, she never excelled in either her courtly or Bene Gesserit studies. Little is known of Irulan's childhood, but one tendency emerged early in life: her obsession with writing. Beginning at the age of five, she kept a journal and later confided her thoughts to a diary. As she entered Bene Gesserit training, she continued both the diary and the journal; the diary enabled her to develop her analytic capacities, especially in regard to human character, and the journal prepared the way for her growth as an historian. Her journalistic and her introspective tendencies were enhanced by the Bene Gesserit training with its emphasis on observation and analysis. The Bene Gesserit Reverend Mothers came to regard Irulan as one of the weakest links in their power structure; Irulan remained an independent thinker, and what she thought about most was an exception to the qualities usually demonstrated by the people in cloister around her.