the Moors in 1191. Sancho I dedicated much of his reign to political and administrative organization of the new kingdom. He accumulated a national treasure, supported new industries and the middle class of merchants. Moreover, he created several new towns and villages (like Guarda in 1199) and took great care in populating remote areas in the northern Christian regions of Portugal – hence the nickname "the Populator". The king was also known for his love of knowledge and literature. Sancho I wrote several books of poems and used the royal treasure to send Portuguese students to European universities. He died in Coimbra, aged 56. Marriage and issue Sancho married Dulce of Aragon, daughter of Ramon Berenguer IV, Count of Barcelona and Petronilla, Queen of Aragon. Eleven children were born from this marriage, eight of whom reached adulthood: Theresa (1175/117618 June 1250), became the wife of King Alfonso IX of León and was beatified in 1705; Sancha (118013 March 1229), founded the Monastery of Celas near Coimbra where she lived until her death. Her sister Theresa arranged for her burial at the Monastery of Lorvão. She was beatified by Pope Clement XI in 1705, the same year as Theresa; Constanza (May 1182before 1186 or August 1202). According to Rodrigues Oliveira, she must have died before 1186 since her name is not registered in any of the documents of the chancellery of Sancho I which begins in that year. However, the necrology of São Salvador de Moreira records the death "III Nonas Augusti" in 1202 of "Domna Constantia Infantula filia regis domni Sancii et reginæ domnæ Dulciæ"; Afonso (23 April 118625 March 1223), succeeded his father as the third king of Portugal; Raimundo (1187/889 March bef. 1188/89), died in infancy; Peter (23 February 11872 June 1258), married Aurembiaix, countess of Urgell; Ferdinand (24 March 118827 July 1233), count through his marriage to Joan, Countess of Flanders; Henry (aft. March 11898 Dec aft. 1189), died in infancy; Mafalda (1195/11961 May 1256), married Henry I of Castile and was beatified in 1793; Branca (119817 November 1240), probably the twin sister of Berengaria, was raised in the court with her father and his mistress "a Ribeirinha" and, when she was eight or ten years old, was sent to live with her sisters at the Monastery of Lorvão. She was a nun at a convent in Guadalajara and was buried at the same monastery as her