My Family Tree

I believe these are the patriarchs of the Robertson's in the Scot-Irish Settlement of Augusta Co, VA:
"This Robertson lineage has been traced back to our 8th great-grandfather Robert Robertson born circa 1659 at Glasgow, then in Lanarkshire, Scotland. Robert married a Mary Berry sometime around 1683. Four known children were produced of this union between 1684 and 1692. It is probable that Robert lived his entire life in Scotland. It is not known when he died.

James Robertson, son of Robert and Mary, was born circa 1685 at Glasgow. He likely left Scotland as a young man and migrated to that area of the “Ulster Plantation” now known as County Londonderry. He eventually settled in the town of Coleraine located near the border with County Antrim, Northern Ireland. Here he met and married Rebecca Royston, a native of Coleraine, around 1711. James is recognized as the progenitor of this family line in America. Based upon currently known information it is likely that James Robertson brought his family to America sometime between 1720 and 1740. Records do show a James Robertson as landing in the Colony of Virginia in 1738. After his arrival in the “New World” James followed many other Scots-Irish pioneers west to Augusta County, Virginia. He eventually settled near Staunton located in the Shenandoah Valley of western Virginia in the midst of the Blue Ridge Mountains of the Appalachian Mountain chain. James passed away in 1749 at the age of 63 years.

William Robertson, son of the aforementioned James and Rebecca, was born near Coleraine, Northern Ireland, in 1720. He accompanied his family on the ocean voyage to America as well as the journey west to Augusta County. Here he met and married Lettica Kerr, daughter of James and Martha Kerr. William and Lettica continued to live in Augusta County where they raised a large family of at least 12 children. William lived a long life and left numerous descendents. He died in Augusta county at the age of 92 years."
https://freepages.rootsweb.com/~tqpeiffer/genealogy/Documents/Surnames/MMPS/Robertson/ROBERTSON%20Surname%20Webpage%20MMPS.htmIn 1738/9, James Kerr purchased land in the Orange/Augusta County, Virginia area, where they migrated with several other prominent Scotch families (Buchanan, Steele, Pickens, Anderson, Allison, Campbell, Robertson and Hays just to name a few).

If they arrived with the Kerr's, they would have come thru Philadelphia about 1728 to 1730, settled in Lancaster, PA before moving to Augusta:
"In 1738/9, James Kerr purchased land in the Orange/Augusta County, Virginia area, where they migrated with several other prominent Scotch families (Buchanan, Steele, Pickens, Anderson, Allison, Campbell, Robertson and Hays just to name a few)."
https://freepages.rootsweb.com/~carrkerr/genealogy/tree13.html