1681

"In this Countrey [sic] each Man, even the greatest, hath but one Wife; but a Woman often has two Husbands. For it is lawful and common with them for two Brothers to keep house together with one Wife, and the Children do acknowledge and call both Fathers"

[Source: Robert Knox, An Historical Relation Of the Island Ceylon, in the East-Indies: Together With an Account of the Detaining in Captivity [of] the Author and divers other Englishmen now Living there, and of the Author's Miraculous Escape (London: Richard Chiswell, 1681), 94, in "Evidence For The Sexual Side of Joseph Smith's Polygamy," Comments by D. Michael Quinn on Session #2A "Reconsidering Joseph Smith's Marital Practices," Mormon History Association's Annual Conference, Calgary, Alberta, Canada, 29 June 2012 (unabbreviated version, revised during July)]