Levi Allen was the second oldest of Theophilus & Elizabeth Allen. I can give you the line.
Theophilus Allen was the oldest of the children of John Rhodum "Rhody" Allen & Mary Emily Ransom.
John Rhodum Allen was the son of Thomas Allen. He had many siblings.
Thomas Allen was the son of Robert Allen of Ireland, commonly called Robert the Immigrant.
Look at the Portrait Books for Pike & Calhoun Counties, IL. Alfred Bryant Allen gives most of the children of Theophilus & Elizabeth Allen in his bio. Also check Pike Co., IL Genweb for some of the bios. I wrote about the family.
Find-a-grave has Levi's gravestone and other Allen buried in Ohio Co., KY.
There is a Levi Allen descendant named David Allen in Clarksville, TN who is researching Levi's descendants. He is very knowledgeable about your line. I don't want to put his phone number here, but he is in the phone book.
We are gathering info about Levi's first family,--- Alfred, Bradford, and Marion Franklin Allen.