'''Anthony, John, and Eustathius (Eustathios (or Eustace)''' are 14th century [[martyrs]] (1347) of the [[Russian Orthodox Church]]. They were attached to the Muscovite mission in the court of the pagan warlord, Algirdas (Olgierd) of Lithuania. Algirdas was married to a Russian [[Christian]] princess, and the missionaries were permitted only to minister to the religious needs of the princess and her retinue. All [[Proselytism|proselytising]] was strictly proscribed. The three youths were apprehended for preaching in public and brought before Algirdas, who ordered them to consume meat during a solemn [[fast]]. When they refused, he had them tortured and killed. Their incorrupt [[relics]] are entombed in a crypt below the [[altar]] of the [[cathedral]] [[church]] in the [[Monastery]] of the Holy Spirit in Vilnius (Vilna), Lithuania.