sentences:  Ian Graham visited Tres Islas in 1965, 1966 and 1970 and reported three fallen Maya stelae.In 2003, the Cancuen Project initiated archaeological exploration of the site.Preliminary investigations in the area of Tres Islas and Cancuen revealed evidence of inhabitation from the Late Preclassic period (c.400 BC - 250 AD) through to the Late Classic (c.600-900 AD).