Bayard (French: Bayard; Italian: Baiardo; Dutch: (Ros) Beiaard) is a magic bay horse in the legends derived from the chansons de geste. He is renowned for his spirit, and possesses the supernatural ability to adjust his size to his riders.
Bayard first appears as the property of Renaud de Montauban (Italian: Rinaldo) in the Old French twelfth century chanson de geste Quatre Fils Aymon. The horse was capable of carrying Rinaldo and his three brothers ("the four sons of Aymon") all at the same time and of understanding human speech. Near the end of the work, Renaud is forced to cede Bayard to Charlemagne who, as punishment for the horse's exploits, has a large stone tied to Bayard's neck and has the horse pushed into the river; Bayard however smashes the stone with his hooves and escapes to live forever more in the woods.
In Bulfinch's Mythology, Rinaldo's acquisition of Bayard is described as follows: a disguised Maugris (who had previously acquired Bayard) tells Rinaldo that a wild horse under an enchantment roams the woods, and that this horse belonged initially to Amadis of Gaul and can only be won by a knight of Amadis' lineage. Rinaldo eventually subdues the horse by throwing it on the ground, breaking the enchantment.
Bayard by the late 13th century also acquired common usage as a name for any bay-coloured horse (reddish-brown coat with black mane and tail) and lost some of his lustre as a magic heroic horse. The name "Bayard" became associated in English literature with a clownish, blind and foolish horse.
Chaucer first used "Bayard" in a simile in the epic poem Troilus and Criseyde. As Troilus has been scorning the power of love before seeing Criseyde and falling in love himself, so Bayard, proudly skipping "out of the wey" while he pranced, had to admit "Yet am I but an hors". Chaucer also used "Bayard" in The Canterbury Tales (c. 1286) to denote a randy stud in "The Reeve's Tale" and a blind, foolish horse in "The Canon's Yeoman's Tale": "Though ye prolle ay, ye shul it nevere fynde. Ye been as boold as is Bayard the blynde. That blondreth forth and peril casteth noon." ("Though you search afar, you shall never find it; Be you as bold as Bayard the blind, that blunders forth and perceives no peril.")
Outside the Walloon town of Dinant in Belgium stands "Bayard Rock", a large cleft rock formation that was said to have been split by Bayard's mighty hooves. In Namur, the next town downriver along the River Meuse, stands a locally famous statue of the Horse Bayard and the Four Aymon Brothers. There are plenty of named places in Wallonia linked to the legend of Four Aymon Brothers and Bayard.
The Bayard legend is also celebrated in other towns in Belgium -- most notably in the Flemish town of Dendermonde, where a large procession is organized every ten years. The rivalry between Dendermonde and Aalst, a city close by, has led to the construction of the Steed Balatum[clarification needed] by the inhabitants of Aalst, as a parody on Bayard. Processions are also organized at Mechelen and Ath. There are Bayard statues at Ghent and Grembergen.
A similar magical horse named "Blind Byard" is part of Lincolnshire folklore at Byard's Leap.