The Mightiest Heart by Lynn Cullen buy used Used & Rare price $16.85 new from$24.89 shop with confidence SPECIAL SHIPPING CONSIDERATIONS FOR USED & RARE ITEMS. Please see the special considerations for shipping Used & Rare items, including extended delivery times, possible import duties & taxes. Delivered in 3-5 weeks Format: Hard cover Publisher: Dial Books Condition: The following ISBNs are associated with this title: ISBN - 10:0803722931 ISBN - 13:9780803722934 Seller Comments: Paper over boards, glued binding, 32 pgs., illustrations. Audience: Children/juvenile. From the Publisher Based on a Welsh legend about Prince Llywelyn and his loyal dog Gelert, who is wrongly banished when the prince believes that the dog has attacked his son.