Philip, Duke of Mecklenburg Philip, Duke of Mecklenburg Philip, Duke of Mecklenburg, sometimes called "Philip I" (12 September 1514 - 4 January 1557) was a Duke of Mecklenburg-Schwerin. He was the youngest son of Henry V, Duke of Mecklenburg, and Helen of the Palatinate, a daughter of Philip, Elector Palatine. As a result of an injury at a tournament he was mentally ill for many years. After Henry V's death in 1552, he lived at the court of Duke Ulrich of Mecklenburg in Güstrow, where he died. Whether he ruled actively is questionable in the light of his disability. He was buried in the
Prince Friedrich of Hesse and by Rhine alone "like Frittie." Two of Friedrich's sisters, Irene and Alix, also had haemophiliac sons. Prince Friedrich of Hesse and by Rhine Prince Friedrich of Hesse and by Rhine (Friedrich Wilhelm August Victor Leopold Ludwig; 7 October 1870 – 29 May 1873) was the haemophiliac second son of Louis IV, Grand Duke of Hesse, and Princess Alice of the United Kingdom, one of the daughters of Queen Victoria. He was also a maternal great-uncle of Prince Philip, Duke of Edinburgh through his eldest sister Princess Victoria of Hesse and by Rhine. Friedrich, called "Frittie" in the family, was a cheerful and