The place of birth I found today for James Mills Rowland (up until then just James Rowland b c1765) was Garthbeibio, Montgomeryshire. Rumour up until then was only that Montgomeryshire was involved and it was and still is suspected that he joined the Montgomery Militia in Newtown, Mtgy, then South Wales Borderers and then Royal South Lincs Militia (hence the Lincs connection). He served in Napoleonic Wars in Salamanca - wounded - no records found.
The year of birth is earlier than thought - 22.5.1762.
He is on the 1841 census in Great Baddow, Essex (as James Rowland b "out of ?county/country") where he died in 1846.
Married twice: 1. Elizabeth Joceylin (Joslin) of Essex - married in Bishops Stortford in 1794. Oldest son Robert Joslin Rowland b 1797 Stamford All Saints, Lincs. 2. Hannah Mabbs - married 1815 in Gt. Baddow, Essex. Numerous children - most males military. Died 1846 Gt. Baddow, Essex.
His mother is Sinah on the entry I found (FSOrg: Index C09057-1, Wales-ODM, Source film no. 104784). Father's name given as Rowland Mills.
Almost all the male children and James himself were Tailors and some were Sgt Master Tailors in the Army, including him. Originally his name was spelt with an "s" at the end but some lines of the family seem to have dropped it, including James and all his children.
Sue