Agatha Christie was born in 1890, when Queen Victoria was still on the throne. The next monarchs were Edward VII, George V, Edward VIII and George VI. Queen Elizabeth II came to the throne in 1952, and was still the reigning monarch when Agatha Christie died in 1976. So Agatha Christie saw two Queens and four Kings in her lifetime.
George W. Armstrong died in 1877.
George W. Armstrong was born in 1827.
George Johnson Armstrong was born in 1902.
George Johnson Armstrong died in 1941.
George Dod Armstrong was born in 1813.
George Dod Armstrong died in 1899.
George Armstrong - engineer - died in 1901.
George Armstrong - engineer - was born in 1822.
George Armstrong - baseball - was born in 1924.
George Armstrong - baseball - died in 1993.
George Robert Armstrong was born on 1819-08-01.