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In page Alfonso II of Aragon:

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Apart from common interests, kings of Aragon and Castile were united by a formal bond of vassalage the former owed to the latter.[citation needed] Besides, on January 18, 1174, in Zaragoza Alfonso married Sancha, sister of the Castilian king.[4] Another milestone in this alliance was the Treaty of Cazorla between the two kings in 1179, delineating zones of conquest in the south along the watershed of the rivers Júcar and Segura. Southern areas of Valencia including Denia were thus secured to Aragon. Alfonso also reached an agreement, the Treaty of Sangüesa (1168), with Sancho VI of Navarre dividing the territory of the Taifa of Murcia between them.