In which year of the 20th Century were there three reigning kings?

In 1936, three reigning kings in the United Kingdom were a result of a notable series of events surrounding the British monarchy. The timeline began with King George V, who passed away in January of that year, leading to his son, King Edward VIII, ascending the throne. However, King Edward VIII's reign was brief due to his decision to abdicate in December of 1936 in order to marry Wallis Simpson, an American divorcée, which was considered controversial at the time. Following Edward's abdication, his brother became King George VI. Thus, during 1936, the country saw transitions between King George V, King Edward VIII, and briefly King George VI.

This specific year is significant in the context of British history because it highlights the dramatic shifts in the monarchy and the impact of personal choices on royal succession. The other years mentioned do not have a similar succession story featuring three reigning kings within a single calendar year.