Final answer:
The Greek historian who visited Egypt and lauded its greatness in 'Histories' was Herodotus.
Step-by-step explanation:
The Greek historian who visited Egypt around 400 BCE and praised its greatness in his work 'Histories' was Herodotus (484 – 420 BCE). Herodotus is often referred to as the 'Father of History,' and he traveled extensively, gathering information and documenting various cultures, which included his observations of Egypt. Unlike Thucydides, who is known for his account of the Peloponnesian War, Herodotus focused on a broad history that included insights into foreign lands and cultures, thereby setting the foundation for historical inquiry that relies on primary sources.