Has the prophecy that the Gentiles would trust in the root of Jesse been fulfilled?

The prophecy concerning the Gentiles trusting in the root of Jesse has not been fulfilled. According to the context, it never happened in history, but it is going to happen. The root of Jesse refers to Christ, the son of David, who will rise to reign over the Gentiles and in whom they will trust.

Les explains that God was dealing primarily with the nation of Israel from Abraham until the book of Acts, but He did not forget the Gentiles. He could not deal with them until Christ went to the cross. The root of Jesse refers to Jesse, the father of David, and Christ is considered the son of David, connecting the line of Jewish kings. Quoting Isaiah, Les notes the prophecy that a root of Jesse would rise to reign over the Gentiles, and in him the Gentiles would trust. He states it never happened, but it is going to.

Isaiah 11:10

And in that day there shall be a root of Jesse, which shall stand for an ensign of the people; to it shall the Gentiles seek: and his rest shall be glorious.

Who was Jesse and how is he connected to Christ?

Jesse was the father of David, and Christ is considered the son of David. The connection runs from Jesse through David, Solomon, and the whole line of Jewish kings; Isaiah foretold a root of Jesse who would rise to reign over the Gentiles, in whom Gentiles would trust.