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In page Xenia Borisovna of Russia:

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She was spared, but False Dmitriy raped her and kept her in his palace as a concubine lasting five months.[citation needed] Before the arrival of his bride Marina Mniszech, Xenia was sent to the Voskresensky Monastery in Beloozero[1] and forced to take monastic vows, whereupon she was given the name "Olga". Subsequently, she was transferred to the Assumption Princess Monastery in Vladimir. According to one account, she was pregnant and bore a son of False Dmitry in the monastery.