1 Corinthians 9:5
Do we not have the right to take along a Christian wife,
 as do the rest of the apostles, and the brothers of the
Lord, and Kephas?
Luke, in the Acts of the Apostles, clearly acknowledges Peter's leadership role.
Acts 2:14
    Then Peter stood up with the Eleven, raised his voice,
     and proclaimed to them, "You who are Jews ..."
      Acts 3:12
    When Peter saw this, he addressed the people, "You
    Israelites, why are you amazed at this?"