The earliest known writing about the Lord’s Prayer is by Tertullian, who lived in North Africa, 160-225.
In addition to exploring the meaning of the phrases within the prayer, Tertullian notes that the order of the prayer is also important. First we pray about heavenly things: the name of God, the will of God, and the kingdom of God. Only then do we pray for our earthly needs: daily bread, forgiveness, and protection.
Tertullian links this order to Jesus words, “Seek first the kingdom, and then these things shall be given you besides” (Matthew 6:33).