The first ghost (having been foretold by Marley) was to take Scrooge back to his previous Christmases and allow Scrooge to see what it was like for him then and how this changed him
The Ghost of Christmas Past.
The ghost of Christmas past was the first spirit to visit scrooge in a Christmas carol.
Marley
The Ghost of Christmas Past/the first ghost
The very first was Jacob Marley but the first foretold ghost was the Ghost of Christmas Past
Jacob Marley was the first ghost - he was formerly Scrooge's business partner, then The Ghost of Christmas Past, The Ghost of Christmas Present and The Ghost of Christmas Yet To Come.
The very first ghost is Jacob Marley
A Christmas Carol was the only name used by Dickens
The Ghost of Christmas Present
The four ghosts in The Christmas Carol are Jacob Marley, the Ghost of Christmas past, the Ghost of Christmas Present, and the Ghost of Christmas Yet to Come.
At one am chrsitmas morning
first the ghost of his old business partner Jacob Marley visits then the ghost of Christmas past then the ghost of Christmas present and finally the ghost of Christmas future