Systematic historical thought emerged in ancient Greece, a development that became an important influence on the writing of history elsewhere around the Mediterranean region. The earliest known critical historical works were "The Histories", composed by Herodotus of Halicarnassus (484 – c. 425 BCE) who later became known as the "father of history" (Cicero). Herodotus attempted to distinguish between more and less reliable accounts and personally conducted research by travelling extensively, giving written accounts of various Mediterranean cultures. Although Herodotus' overall emphasis lay on the actions and characters of men, he also attributed an important role to divinity in the determination of historical events. Thucydides largely eliminated divine causality in his account of the war between Athens and Sparta, establishing a rationalistic element that set a precedent for subsequent Western historical writings. He was also the first to distinguish between cause and immediate origins of an event, while his successor Xenophon ( – 355 BCE) introduced autobiographical elements and character studies in his Anabasis.