Jaca is a town in the province of Huesca. It is situated in the Pyrenees, ca. 70 kilometers north of the city of Huesca, and circa 30 kilometres from the Somport Pass between Spain and France. A couple of daily trains connect it via Huesca with Zaragoza that is well connected with Madrid and Barcelona by high-speed trains. There are frequent busses (AVANZA) that connect Jaca with Huesca. Some continue to the Zaragoza Delicias interchange (high-speed trains) station. Others connect at Huesca with busses to Zaragoza and Barcelona.

The city sits on a major pilgrim's route from France to Santiago de Compostela. This crosses the Aragón River just outside Jaca, where there is a mediaeval bridge. To protect the Pyrenean passes from Arab incursions, Charlemagne created the County of Aragón in the valley of the Aragón River. Over time, it became subordinate to the Kingdom of Navarra. In the eleventh century, it developed into the kingdom centred around Jaca that would become one of the two major powers that united into present-day Spain.

With the former episcopal see of Huesca remaining in Arab hands, Pope Alexander II conceded King Sancho Ramírez the episcopal see of Jaca. Construction of the cathedral started between 1077 and 1082. It is one of the first Romanesque cathedrals built in the Iberian Peninsula. Although it underwent changes in later centuries, it preserves much of its original structure.

The cloisters of the cathedral house the diocesan museum (closed on Mondays). It holds a very important collection of Romanesque murals. The murals were recovered from churches in the region and transferred to the diocesan museum of Jaca.

Situated in the Calle Mayor is the town hall with its Aragonese Renaissance façade.

At the end of the sixteenth century, King Felipe II of Spain ordered the construction of citadels to protect his country against French attacks. The citadel of Jaca, located just outside the historic centre is the best preserved of these citadels.

The post office is situated on the N330a main road, on the edge of the historic centre. I took the opportunity to buy some B-tariff (Europe) stamps and hand in my postcards.
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