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In page Margaret of Masovia:

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After the death of Margaret's mother, Siemowit remarried to Anna of Ziębice. They had a couple of children who died young before Anna gave birth to a healthy son, Henry. Siemowit did not believe the child was his; he accused his wife of adultery and had her strangled. Henry was then cast away. After a few years it was reported that the child had physical similarities to his father. Margaret decided to rescue her half-brother and took him to her mansion in Słupsk. Siemowit later accepted that the child was his and made him Bishop of Płock.[citation needed]