From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be leader of', Sentence: 'Louis Farrakhan is currently the leader of the Nation of Islam and lives in Chicago , Illinois at the former home of Elijah Muhammad , near the campus of the University of Chicago .'
leader

Given Relationship: 'be hero of', Sentence: 'In this poem Sappho makes the astonishing statement that the true hero of the Trojan War is not Achilles or Agamemnon , but Helen !'
hero

Given Relationship: 'be center of', Sentence: 'No one disputes what all churches agreed upon , that the center of gravity in the Holy Bible is the Lord Jesus Christ , the Saviour of the world .'

center