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In page Söyembikä of Kazan:

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She is a national hero of Tatarstan.[citation needed] Her name is associated first of all with Söyembikä Tower, that Ivan the Terrible wanted to marry her, so she agreed that if he built her a tower made with seven tiers (one for each day of the week) then she would marry him. Ivan the Terrible supposedly finished the tower within the week, so Söyembikä went up to the top of the tower and after looking out at her beautiful home of Kazan she became so overwhelmed with emotion for her people that she couldn't bear to marry the tsar and jumped off. However, the true date of her death, and her gravesite, remains unknown.[1]