
During the Middle Ages the term "rouncey" (also spelt rouncy or rounsey) referred to an ordinary, all-purpose horse. Rounceys were used for riding, but could also be trained for war. It was not unknown for them to be used as pack horses. The horse, which was also referred to as runcinus, is believed to have been a harrowing animal on account of its proportions as found in demesne stock-listings before it became an exclusively riding animal.
While the destrier is the most well-known warhorse of the Medieval era, it was the least common, and coursers were often preferred for battle. Both were expensive, highly trained horses prized by knights and nobles, while a poorer knight, squire or man-at-arms would use a rouncey for fighting. A wealthy knight would provide rounceys for his retinue.
Sometimes the expected nature of warfare dictated the choice of horse; when a summons to war was sent out in England in 1327, it expressly requested rounceys, for swift pursuit, rather than destriers. Small sized rounceys were also preferred by mounted archers.
Runcinus - a rouncey, the most common term for horses found in the Domesday survey. It is felt by some that the rouncey was primarily a riding or pack horse at this time, although [...] its proportions in the demesne stock would seem to point to its use as a harrowing animal. After Domesday, runcini are infrequently found among demesne or peasant stock listings, and gradually they seem to have come to represent a class of riding animals only.