of the claims of the Pennsylvanians in every respect. Charles's error ultimately resulted in the loss to Pennsylvania of approximately one thousand square miles of Maryland territory. Return to England In 1732 Calvert returned to England, again leaving the government of Maryland in the hands of Governor Samuel Ogle, and pursued a successful career in English politics. He was a Fellow of the Royal Society and a friend of fourth-cousin, Frederick Louis who was Prince of Wales and the eldest son of King George II of Great Britain. He was Gentleman of the Bedchamber to the Prince of Wales between 1731 and 1747. In 1739 he sailed on his new yacht Augusta for Russia to represent the British Royal Family at the marriage of Grand Duchess Anna Leopoldovna of Russia to Anthony Ulrich, Duke of Brunswick-Lüneburg. The union, designed to strengthen the relationships between the houses of Romanov and Habsburg, was celebrated in grand style. Francesco Algarotti, the Italian polymath accompanied Calvert and sent detailed accounts of the journey to and from St Petersburg to his friend Lord Hervey. Also in the party were mathematician Erasmus King, and young Thomas Desaguliers, son of Dr John Theophilus Desaguliers. Baltimore was elected Member of Parliament (MP) for St Germains, a rotten borough in Cornwall, from 1734 to 1741, and was MP for Surrey from 1741 to 1751. He was Lord of the Admiralty from 1742 to 1744, and from 1747 to 1751 he was Surveyor-General of the Duchy of Cornwall. In addition, he was Cofferer of the Household to the Prince of Wales from 1747 to 1751. Calvert was able to sit in the House of Commons as a member of the Irish peerage. Irish peerages were often used as a way of creating peerages which did not grant a seat in the English House of Lords and so allowed the grantee to sit in the House of Commons in London. As a consequence, many Irish peers had little or no connection to Ireland. George II said of Charles Calvert: "there is my Lord Baltimore, who thinks he understands everything, and understands nothing: who wants to be well with both Courts and is well with neither, and who, entre nous, is a little mad." Family On 20 July 1730, Charles married Mary Janssen, who died at Chaillot, Paris, on 25 March 1770, the daughter of Sir Theodore Janssen, 1st Baronet, and Williamza