Re: BUCHANAN'S OF LINCOLN CO., TENN.
I have data on Buchanan , only two of David Buchanan's childern married Gibson ,daughter Isabell married John H. Gibson, and your ancestor Sameul Steel married Mary Gibson.
David's parents are Andrew Buchanan & Joanna Hays , Andrew is the brother to my ancestor John Buchanan, their parents are Sameul Buchanan and Martha Edmondson , Samuel's father is Alexander Buchanan .
The Irwin's in the late date you give I have no links I Can add at this time as my research for Irvine (Irving/Irwin) is from 1066 Scotland down thru the 1600 American family's .
Patterson's are in a number of my family lines but don't have links to your ,my John Buchanan did marry twice his 2nd wife was Jane Patterson.