The siege of Albarracín was a battle fought during the reign of Peter III of Aragon, King of Aragón from the months of April to September 1284.

The local nobility, taking advantage of the questionable legal status, declared their independence (de facto) from both Valencia and Aragon.

In June 1283, Peter III was in the area of Tarazona conducting attack on Navarre and Aragón in which he conquered and sacked various towns, the Castle of Ull amongst them.

In winter of 1283, whilst Juan Núñez I de Lara was in Treviño raising Navarese reinforcements to defend his city from the Aragonese who had by then declared war against him, he was besieged by Peter III of Aragon at Albarracín with only around 200 knights.

[2] From April until September 1284, the besieging forces built their camp in the streets of the town of Albarracín (literally on Calle de los Palacios) for their soldiers to remain under cover and in comfort with stores and housing for the winter.