Political Union of Aragon and Barcelona in the 1070s

Timeline

1. 1071–1074Barcelona · CataloniaSancho Ramires ruled Aragon and Ramon Berenguer I ruled Barcelona. The two sides negotiated and conducted joint military operations on Muslim frontier defense, territorial division, and countering Castilian power, forming a de facto political collaboration.
2. 1076Jaca · AragonIn 1076 Ramon Berenguer I died, and Barcelona was jointly ruled by Berenguer Ramon II and Ramon Berenguer II. That same year Sancho Ramires inherited the Navarrese throne at San Juan de la Peña, bringing major adjustments to the Christian political map of the northeast.
3. 1077–1080Zaragoza · AragonAragon and Barcelona continued to pressure Muslim taifas in the Ebro valley and consolidated their relationship through marriages and treaties. Though no unified crown had yet formed, the interests of the two houses grew increasingly intertwined, laying the groundwork for the formal merger of 1137.