Battle of Rovirans
985 CE.
Shown on the map at 41.561°, 2.008°.
The Battle of Rovirans or Matabous was fought in 985 near Terrassa, between the Christian troops of Borrell II and the Muslim troops of Almanzor. The troops of Borell were defeated and Almanzor was able to continue with his campaign, reaching as far as Barcelona, which he sacked.
Text from the Wikipedia article Battle of Rovirans, licensed CC BY-SA 4.0.