Despite the obvious fact that Lewis has a lesser role than that of the eponymous stallion in St. Mawr, this paper highlights the Welsh groom, rather than the horse, locating his Celtic alterity in colonial confrontation. Lewis`s interaction with other characters may present some striking aspects in that light. As Mrs. Witt`s brief romance with him forms a sub-plot that reflects Lou`s dramatic encounter with St. Mawr and its aftermath, the narrative development of St Mawr intimates a certain structural doubling between Lewis and Lou. Initially, Lewis is aligned with Phoenix, the other groom and racial other from America. What happens later, however, is no less than a mockery of Phoenix`s racial difference, in notable contrast to the vicissitude of Lewis`s Celtic identity. Although Lawrence`s presentation of Lewis as a superstitious, childlike, and femininely-sensitive man undeniably implies the discursive field of Celticism, the same character is granted primeval "Britishness." Along with the structural doubling of Lou and Lewis, such a turn indicates the significant extent to which Lewis`s Celtic otherness allows Lou to transform her white subjectivity without resorting to a primitivist pursuit of an indigenous male. Lawrence, in this way, draws a meaningful, if subtle, distinction between the New England woman and Lou in their seemingly shared but profoundly different grasp of "wild America."