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A “catalog” hymn in which the first and final stanzas could frame one or more of the 21 inner stanzas devoted to giving thanks for particular leaders in the New Testament, including Simon.
To distinguish him from Simon Peter, he is given a surname in all three of the Synoptic Gospels where he is mentioned. Simon is called "Zelotes" in Luke and Acts (Luke 6:15 Acts 1:13). For this reason, it is generally assumed that Simon was a former member of the political party, the Zealots.
Background information source: Wikipedia