Yes, but the Old 300 are the newcomers in the family.
Original Texas ancestor was kicked out of Spain in 1492/3 and made it to Mexico, then Texas, not too long after that.
Ranch still sits on the Spanish land grant (which my grandmother (age 103) still has).
Awesome roots.
Our original "league of land" is out of the family, but I have the copy of the Spanish Land Grant, signed by Estevan F. Austin, John Austin, and Samuel M. Williams. It's dated August 3rd, 1824. (Just happen to have it in front of me.)