The sudden death of the Tsar on 13 April 1605 removed the main barrier to further advances by Dimitry. Russian troops began to defect to his side, and, on 1 June, boyars in Moscow imprisoned the newly crowned tsar, Boris's son Feodor II, and the boy's mother, later brutally murdering them. On 20 June the impostor made his triumphal entry into Moscow, and on 21 July he was crowned Tsar by a new Patriarch of his own choosing, the Greek Cypriot Patriarch Ignatius, who as bishop of Ryazan had been the first church leader to recognize Dmitry as Tsar. The alliance with Poland was furthered by Dimitriy's marriage ("per procura" in Kraków) with the daughter of Jerzy Mniszech, Marina Mniszech, a Polish noblewoman with whom Dmitry had fallen in love while in Poland. The new Tsarina outraged many Russians by refusing to convert from Catholicism to the Russian Orthodox faith. Commonwealth king Sigismund was a prominent guest at this wedding. Marina soon left to join her husband in Moscow, where she was crowned a Tsarina in May.