Struggle with sister At first, Theresa and Henry were
vassals of her father, but Alfonso VI died in 1109, leaving his legitimate daughter, Queen Urraca of Léon as the heir to the throne. As a daughter Theresa could be a vector of royal authority, so as a wife she bestowed that authority to her husband and then as a widow it was accepted that she might continue to exercise authority on behalf of her male children. Both women, Countess Theresa and Queen Urraca, ruled alone after the deaths of their immigrant husbands, ostensibly in defence of their young children, but also in their own right. Pope Paschal II referred to her as queen in the
papal bull FRATRUM NOSTRUM issued on 18 June 1116. In 1116, in an effort to expand her power, Theresa fought her half-sister, Queen Urraca. They fought again in 1120, as she continued to pursue a larger share in the Leonese inheritance, and allied herself as a widow to the most powerful Galician nobleman for that effect. This was Fernando Pérez,
Count of Traba, who had rejected his first wife to openly marry her, and served her on her southern border of the Mondego. In 1121, she was besieged and captured at
Lanhoso, on her northern border with Galicia, while fighting her sister Urraca. A negotiated peace (
Treaty of Lanhoso) was coordinated with aid from the
Archbishops of Santiago de Compostela and
Braga. The terms included that Theresa could go free only if she held the County of Portugal as a vassal of the Kingdom of León as she had received it initially.
Rebellions By 1128, the Archbishop of Braga and the main Portuguese feudal nobles had had enough of her persistent Galician alliance, which the first feared could favour the ecclesiastical pretensions of his new rival, the Galician Archbishop of Santiago de Compostela,
Diego Gelmírez, who had just started to assert his pretensions to an alleged discovery of relics of
Saint James in his town, as his way to gain power and riches over the other cathedrals in the
Iberian Peninsula. . The Portuguese nobles and warlords rebelled, and the Queen was deposed after a short civil war. Her son and heir,
Afonso, defeated Theresa's troops at the Battle of São Mamede near
Guimarães and led her, along with the Count of Traba and their children, into exile in the Kingdom of Galicia, near the Portuguese border, where the Traba had founded the
monastery of Toxos Outos. Theresa died soon afterwards in 1130. She was succeeded by her son, who would eventually lead Portugal into becoming a fully independent kingdom, and, later, nation state. == Issue ==