High Quality Content by WIKIPEDIA articles! The Xag ra Stone Circle, also known as the Brochtorff Circle since there may be two Circles at Xag ra, is an underground funerary complex, situated in Xag ra on the Maltese island of Gozo. IT was first discovered by John Otto Bayer in the 1820s and rediscovered in 1964 after Gozitan researcher Joe Attard Tabone examined a painting by Charles Brochtorff in the National Library in Valletta. IT was excavated by a joint team from the University of Malta, the Maltese Museums Department and the University of Cambridge. THe excavation uncovered the burial ground of the same community which practised its rituals in the nearby Ggantija temple, dating principally to the period from 3000 to 2400 BC.