There is a baptism for Silverthorn Stokes in October 1821, son of Mark and Lavinia in Colston, Wiltshire.
Further down the page there looks to be a baptism of John Stokes, son of John and Ann, of Westrop (?) Wilts, also in October 1821, but the father is a labourer not a traveller.
Both baptisms are in the parish of Highworth.