Blantyre is Lady Anne’s cousin. The two often ride together, and Blantyre enjoys riding a mare named Lizzie. He’s a good rider and understands that Lizzie is flighty and not appropriate for a lady riding sidesaddle. But when Lady Anne insists on trying Lizzie, Blantyre allows her to do so. He and Black Beauty pursue Lizzie when she bolts with Lady Anne, and they get Lady Anne medical care when she falls.