Having a climax in the story so there will be a turning point.
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Richard gives a short speech detailing his plot against his brother Clarence, who comes before him as heir to the throne of England. Richard has just succeeded in having Clarence arrested and it as a prisoner that Clarence walks onto the stage, guarded by Sir Robert Brackenbury.
"Richard asks Clarence what the reason for his arrest is. Clarence replies that someone told King Edward that a person with a name starting with the letter "G" would cause his family to lose the throne. Since Clarence's full name is George, Duke of Clarence, he was considered to be the primary suspect. Richard complains that this arrest is the result of the women plotting against Clarence, most notably Queen Elizabeth and possibly also Mrs. Shore."
he made a plot against his brother
It gives insight to what kind of person that character is. If their motivation is something pure and kind, then you can tell they are good people. If they have sinister motivations, it can show that they have a dark side. Analyzing motivation helps you understand the character better.