“The stone circles of the Orkneys had similar traditions:in 1703, Martin Martin wrote that the stone circles at Stenness and Brodgar were ‘believed to have been Places design’d to offer Sacrifice in time of Pagan Idolatry; and for this reason the People called them the Ancient temples of the Gods.’ An engraving made in 1823 of the Ring of Stenness, known then as the Temple of the Moon, shows a woman hallowing her promise of betrothal at the stones.”
From “Celtic Sacred Landscapes” by Nigel Pennick 1996, page 53.