Hi! The entry in Richardson's Magna Carta Ancestry for the parents of Gateway Ancestor John Bevan is pretty sparse (quoted below), but it does say they married about 1664 and cites Glenn's Merion in the Welsh tract..., which I've just used to determine that John Bevan and Barbara Aubrey married about 1664.
So I'm trying to figure out if any of the other sources have the 1664 marriage date for John's parents also. If not, then I can disregard it as the marriage year for John's parents (which creates a serious timeline problem).
The other sources Richardson gives are "Clark, Limbus, Patrum Morganiae et Glamorganiae (1886): 354. Lyle, Thomas Fam. (1908): 14-18. TAG 39 (1983: 1-2)."
"Jane Richards, married about 1664 Ieuan ap John, of Treverigg (in Llantisant), Glamorgan, son and heir of John ap Ieuan of Treverigg (in Llantrisant), Glamorgan, by Elizabeth, daughter of Thomas Richards. He was underage at his father's death in 1630. They had four sons, including John, Gent. Ieuan Ap John died before 1665." (Magna Carta Ancestry, Vol I, p192, BEVAN #20.)