Full context:   In many civilizations, pantheons tended to grow over time. Deities first worshipped as the patrons of cities or other places came to be collected together as empires extended over larger territories. Conquests could lead to the subordination of a culture's pantheon to that of the invaders, as in the Greek Titanomachia, and possibly also the Æsir–Vanir war in the Norse mythos. Cultural exchange could lead to "the same" deity being revered in two places under different names, as seen with the Greeks, Etruscans, and Romans, and also to the cultural transmission of elements of an extraneous religion, as with the ancient Egyptian deity Osiris, who was later worshipped in ancient Greece.