What is intercessory prayer? To whom does it belong? Living and the dead?
Seems like Jesus would be our model intercessor. In fact, it seems all Christian prayer is intecessory in nature, since it is offered to God through and by Jesus.
Daniel 9 is an OT model. Here, Daniel says that interecessory prayer seeks only to know God's will and see it fulfilled. It seeks God's glory not our own.
I found this:
The following is only a partial list of those for whom we are to offer intercessory prayers: all in authority (1 Timothy 2:2); ministers (Philippians 1:19); the church (Psalm 122:6); friends (Job 42:8); fellow countrymen (Romans 10:1); the sick (James 5:14); enemies (Jeremiah 29:7); those who persecute us (Matthew 5:44); those who forsake us (2 Timothy 4:16); and all men (1 Timothy 2:1).
There is an erroneous idea in contemporary Christianity that those who offer up intercessory prayers are a special class of “super-Christians,” called by God to a specific ministry of intercession. The Bible is clear that all Christians are called to be intercessors.
After looking and searching, I don't find our forefathers of faith prayering to dead saints for intercessory purposes (unless you count Saul's episode with the Witches).