As Principal of Jesus College from 1661 to 1673, he was responsible for much construction work, including the college library. The position was one of several rewards he received from King
Charles II of England for his loyalty to the
Royalist cause during the
English Civil War.
Judge Due to his close friendship with Archbishop Sheldon, he was also created a judge, first of the
consistory court of
Westminster, then of the
Arches Court and finally of the Court of Admiralty. As Judge of the Court of Admiralty he won
Samuel Pepys' warm praise for his ability and integrity, although Pepys was told that his appointment had not been welcomed by the
advocates at
Doctors' Commons. He played a crucial role in the development of English
Admiralty law as a coherent body of legal principles. He was also an expert on
international law. On the death of the
queen mother Henrietta Maria at
Colombes in August 1669, Jenkins was sent to
Paris to argue that the disposition of her
personal property was governed by English, not French law: the result would be that the property would pass in its entirety to Charles II, rather than to his sister
Henrietta, Duchess of Orleans, who would have been the
beneficiary under French law. His arguments were successful and on his return to England, Charles rewarded him with a
knighthood.
Diplomat He was one of the Commissioners appointed to negotiate the abortive Union with
Scotland in 1669. In the 1670s he spent much of his time on the Continent engaged in a number of diplomatic missions. Notably, he was England's principal representative at the Congress of
Nijmegen (1676-1679) which brought to an end the
Franco-Dutch War, and for a time the sole representative. Critics said that he was "in agony" at being left with the sole responsibility for making decisions. Certainly, as the English government ruefully admitted, Nijmegen was "far from being such a peace as his Majesty would have wished for", although the unsatisfactory outcome from the English point of view was largely due to the resentment of English interference by both French and Dutch representatives at the Congress, rather than to any blunder by Jenkins. ==Secretary of State ==