How did Agatha Christie create poirot?

Agatha Christie created the character of Hercule Poirot to be a meticulous, eccentric, and highly intelligent Belgian detective whose methods rely on his keen observation and analytical skills. Poirot's fastidious nature, distinctive mustache, and reliance on order and symmetry in his investigations help set him apart from other detectives in mystery literature. Christie drew inspiration for Poirot from the Belgian refugees she met during World War I, as well as from her own experiences working as a volunteer nurse and pharmacist during the war.