“Four Reigns” is a historical book about Thailand authored by Kukrit Pramoj that spans from the 19th century to the mid-20th century. Through this narrative, readers are taken through four reigns – King Chulalongkorn, King Vajiravudh, King Prajadhipok and King Ananda Mahidol. It depicts events surrounding the transition of power among kings and how the country’s culture evolved over time.