John, If your Daniel was born abt 1766 he was likely born in Augusta Co., VA. Rockingham Co was formed from Augusta aft 1770. Also Augusta Co bordered east of Frederick Co. A John Reagan (b. 1711 MD?) left a will in 1767 in Frederick Co. VA. John is allegedly the s/o Timothy Sr of MD. John allegedly has a son Charles b. abt 1735 who appears in Dunmore VA in 1772. Dunmore was formed from Frederick in 1772. Charles had a son Henry b. 1762 who md a Phoebe HARRISON (b. 1764 VA), d/o John HARRISON. Charles & Henry moved to Blount Co., TN sometime aft 1783 where Charles died in 1815. Henry & wife Phoebe HARRISON moves on to Overton Co., TN bef 1820 where Henry dies in 1829. I wonder if the Elizabeth HARRISON md to Daniel Reagan is connected to Phoebe HARRISON? Didnt Daniel Eagan marry Elizabeth HARRISON in 1788 Green Co., TN? And isnt your John (s/o Jeremiah) the grandson of Timothy b. 1714 MD (brother of John b. 1711 MD above)? Thus Charles b. 1735 & your Jeremiah b. 1745 related?