Absolutely! The main king who held the Spanish throne for the longest time in history is King Louis XIV of Spain, also known as "Louis the Great" or "The Sun King." He reigned for a remarkable 72 years, from 1700 until his death in 1774. During his reign, he significantly expanded and consolidated Spanish territories, making Spain one of the most powerful empires in Europe. To find this information, you can simply search for "longest-reigning king of Spain" or "Spanish monarch with the longest reign" in an internet search engine or consult a history book or reliable online resource on Spanish history.