Marriage of John Vasa with sister of Polish King enraged Eric. John was accused of treason, sentenced to death by riksdag on 7 June 1563 and imprisoned in Gripsholm castle with his Jagiellon wife. Ivan IV, who asked for Catherine's hand previously, started talks with Eric. He was obsessed about Catherine and wanted Swedish King to send her to him. Eric's advisor Jöran Persson tried to convince Catherine to leave her husband and promised to send her back to Poland. She then showed him ring with inscription Nemo nisi mors "nothing but death [would separate us]. Imprisoned John and Catherine lived under great stress, because they were aware, that John could be executed at every moment and that Eric and Ivan are talking about sending her to Moscow. She was at mercy of two mad men. Luckily Eric also was obsessed about certain woman-he still wanted to marry Elizabeth Tudor. Elizabeth knew John Vasa personally, she met him when he was send to London as Eric's envoy to negotiate their marriage. Elizabeth was concerned about John's fate and send letter to Eric, asking about John and Catherine. That way she propably saved them, because Eric didn't want to ruin his chances to marry English Queen. But what if his hatred prevailed over love? John is executed, while Catherine is handed to Ivan? Ivan was married at the time, but getting rid of wife was never problem for him. Considering his obsession he'll not use Catherine to negotiate peace with Sigismund (Livonia for Catherine's release or something like this). Catherine also would not change faith, unlike her brother but like her son she was devout Catholic. So would Ivan have new wife or new martyr? Sigismund Augustus already was at war with Muscovy, so no change there other than Ivan's black legend getting even blacker.
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