Capital with Mounted Warriors, late 12th century.
Church of San Miguel, Biota, Cinco Villas, Aragon.

The 5th capital on the west portal.*

This is said to be a holy order knight lancing another knight in the back, but, the cross on the shield is unusual. One arm of the cross ends in a leaping horned animal.

Images source: LAS PORTADAS DE SANTIAGO DE AGÚERO Y S.MIGUEL DE BIOTA
West Portico (1). In the late 12th-century Romanesque style, it is located between two large buttresses and protected by a roofed eaves.
Its shape is a semicircular arch with four splayed archivolts with smooth edges, topped by a double baqueton, resting on an impost and smooth columns with decorated capitals and a tympanum depicting the Epiphany, supported by modillions that give the opening an anthropomorphic profile.
According to some authors, the overall decoration of the west and south facades follows an iconographic program that conforms to the thought and theophany of John Scotus Eriugena (The Well Born, 810–877).
Spanish wikipedia
Other 12th Century Illustrations of Costume & Soldiers
Other Spanish and North African Illustrations of Costume & Soldiers