The 14th-century prayer book is part of a larger collection of rare books going to auction this spring.15th-century Book of Hours is expected to fetch as much as $2.5 million when it goes to auction this April. The medieval illuminated manuscript is part of a collection of 17 medieval and Renaissance illuminated manuscripts and 200 printed books that belonged to Elaine and Alexandre Rosenberg. Proceeds from the auction, which will be held by Christie’s in New York on April 23 will benefit the rare book department of designated museums, reported Medievalists.net.According to the Medievalists.net, the highlight of the auction will...