The book is real. It is known as the Talbot Shrewsbury Book (also known as British Royal Library 15 E vi). It is a beautifully illustrated collection of 15 legends, stories, and other information written by several authors. Talbot commissioned it for Henry and Margaret's wedding in 1445. The book includes the illustration of Talbot presenting it to Margaret
Made of parchment bound in 440 pages, it is an example of Medieval/Renaissance book production at its height. The contents start out looking appropriate as a wedding gift for a queen, but near the end they become something else.
The Romance of Alexander the Great is followed by five tales of Charlemagne. After that are two Anglo-Norman prose romances, the story of King Horn and the Romance of Guy of Warwick (one of the most popular medieval romances). There follows a highly creative history of the Crusades.
The last 140+ pages seem to be less oriented toward a queen and more toward a queen's son, leading some to think it was intended for a future son of Margaret and Henry. There is a scholarly dialogue on war and battle, then a Mirror for Princes, a history of Normandy from the 8th century to 1217, a poem about chivalry, and the rules for the Order of the Garter.
If you look closely at the picture, you'll see a little white dog behind the kneeling Earl of Shrewsbury. This is the Talbot Dog, and it has its own place in history, which I'll talk about next.