What do "principles" refer to in a theater production?

In a theater production, "principles" refer to the main actors who take on significant roles in the performance. These actors typically play the lead characters or pivotal supporting roles that drive the narrative and are essential for the story's progression. They are often the most visible and recognizable performers in a production, as their characters are usually central to the plot.

The significance of the term "principles" stems from its association with the hierarchy of roles within a theatrical performance. While supporting actors, technical crew, and audience members all contribute to the overall production, it's the principals who typically bear the responsibility of conveying the primary themes and emotions of the story, capturing the audience's attention and engagement. This distinction highlights the essential nature of the principal actors in bringing a theatrical work to life.