Sentence:  Cattle grazed where now is the Forum Romanum, and the Capitol, now glittering with gold, was covered then with brambles; nevertheless a god already dwelt there, even Jupiter himself, whose right hand had oft been seen to shake the <WSD>aegis</WSD> and summon the storm-clouds. 
Meaning of the word marked with <WSD> tags:  A mythological shield associated with the Greek deities Zeus and Athena (and their Roman counterparts Jupiter and Minerva) shown as a short cloak made of goatskin worn on the shoulders, more as an emblem of power and protection than a military shield. The aegis of Athena or Minerva is usually shown with a border of snakes and with the head of Medusa in the center. (from early 17th c.)