Who are some of the people that can be considered 'worldly Gurus' whose biographies are a form of public service?

Chapter 0 identifies several categories of individuals who can be considered "worldly Gurus." These are great men such as unique politicians, state-founding brave warriors, extraordinary jurists, historians, playwrights, and teachers of vast intellect. The text explains that writing their biographies is a form of both Guru service and public service. However, it clarifies this service is worldly in nature, its importance is not eternal, and because it is often rooted in self-interest, it does not yield the spiritual fruits associated with writing about saints or one's Sadguru.