sentences:  San Luis Rey I was distinguished from San Luis Rey II primarily by the appearance of pottery in the latter, an introduction that was estimated to have occurred as late as AD 1500 or even 1750.Subsequent studies have pushed the local presence of pottery back to at least AD 1000 and perhaps several centuries earlier, calling into question the validity of the phase distinction.A northern limit for the San Luis Rey Complex is defined by the scarcity or absence of prehistoric pottery among the Luiseño's Gabrielino and Serrano kinsmen.