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 Philip, Duke of Edinburgh on Sino-British relations, but it shaped his own reputation. Philip has held a number of titles throughout his life. Originally holding the title and style of a prince of Greece and Denmark, Philip abandoned these royal titles prior to his marriage, and was thereafter created a British duke, among other noble titles. The Queen formally issued letters patent in 1957 making Philip a British prince. When addressing the Duke of Edinburgh, as with any male member of the royal family except the monarch, the rules of etiquette are to address him the first time as "Your Royal Highness", and thereafter