Whatever happened to David ap Rhys, Prince of South Wales (1660-1745)?David Rhys is said to have migrated to the U.S.- for what reason? Did he...

The information on David Ap Rhys is scant, in fact, there is no genealogical mention of David Rhys having come to America.

There were two branches of the Ap Rhys (or Rees) family, one in North Wales and one in South Wales. David Ap Rees was of the South Wales branch. The firmest record available is for Rhys ap Griffith in 1171 who was Prince of South Wales. After marrying with the "Norman Conquerors of England," a distinct English line of the Rees family arose, first recorded in 1599.

David Ap Rhys (Rees) Prince of S. Wales, son of Thomas Rhys (Rees) Prince of S Wales, and father of Rev. David Ap Rhys (Rees) were of the English and had assumed the name spelling of "Rees." It is recorded that Sir Thomas Rees (was Rhys) immigrated to American and settled in the Isle of Wight County in Virginia (with very poor old records) in 1648. Edward Rees, of the English branch but with no connection to Sir Thomas Rees's direct family line, followed and settled in Northampton, Virginia, in 1650. The American emigres added the extra "e" making the spelling Reese. These two men were the founders of the majority of the Reese families in America at the present day.

The final history of the kingdoms of North and South Wales was resolved in the Act of Union 1536:

Finally the unilateral Act of Union in 1536 "incorporated, united and annexed" "Our Dominion, Principality and Countrey of Wales''  to England. Since then English law and government has ruled in Wales, and Wales has constitutionally followed the same path as England