I believe it's a type of horse, probably a type of specially bred war horse. From the books I have read I take it they are spirited, difficult to ride, and very large.
Steed, Destrier,
It is up to you to make that chose.
Destrier means great horse. It was one of the greatest war horses in middle ages.
Midevil timeshttp://content.answers.com/main/content/wp/en-commons/thumb/b/b1/350px-Matthew_Paris_-_William_Marshal.jpg The destrier is the most well-known war horse of the medieval era. It carried knights in battles, tournaments, and jousts. It was described by contemporary sources as the Great Horse, due to its size and reputation. The term destrier is derived from the Vulgar Latin dextarius, meaning "right-sided" (the same root as our modern dexterous). This may refer to the fact that it was led by the squire at the knight's right side (or led by the right hand) or to the horse's pacing (leading with the right). While highly prized by knights and men-at-arms, the destrier was actually not very common. Most knights and mounted men-at-arms rode other war horses, such as coursers and rounceys. These three types of horses were often referred to generically as chargers.from wikipedia
Prince Caspian rode a magnificent black stallion named Destrier in "The Chronicles of Narnia: Prince Caspian."
Medieval is medieval because it is Latin for "the middle ages".
Medieval PeriodDark Age?Medieval times or the medieval era.
in medieval towns
portcullises are medieval as many medieval castles are found with them such as Warwick castle
medieval diet
Medieval times
Medieval castles.