My history book is cited below. My book says that when Charles V abdicated as Holy Roman Emperor, he gave control of his territories in Spain to his son, Philip II. However, what territories did Charles V have in Spain, and how did he gain them? I thought Spain was a powerful kingdom ruled by Ferdinand and Isabella (or their descendants) at that time.
McKay, John, Bennett Hill, John Buckler, Clare Crownston, Merry Wiesner-Hanks, and Joe Perry. A History of Western Society. 10th ed. Print.