"The Champion of Christ of great name..."

St. Theodore Stratelates the Great Martyr (source)

  
The Champion of Christ of great name, he who is beloved by God and the Angels, the wondrous and glorious Theodore, today makes to rejoice everyone under the sun, and the holy Church in the Holy Spirit, and they all celebrate with joy, preparing his memorial.
-Kathisma for the feast of St. Theodore Stratelates the Great Martyr
  
(source)
  

Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!