Prince Boris Ivanovich Kurakin (Russian: Князь Борис Иванович Куракин; 30 July 1676, Moscow – 28 October 1727, Paris)[1] was the third permanent Russian ambassador abroad, succeeding Andrey Matveyev in The Hague[2] and one of the closest associates of Peter the Great.[3] He was also the tsar's brother-in-law, being married to Xenia, daughter of Feodor Abramovich Lopukhin and sister of Eudoxia Lopukhina.