Grenville also took the additional family names Nugent and Temple by Royal Warrant issued on 4 December making the compound family name Nugent-Temple-Grenville. In 1782, Lord Temple was appointed Lord Lieutenant of Buckinghamshire and in July 1782, he became a member of the Privy Council and Lord Lieutenant of Ireland in the Ministry of Lord Shelburne. He was instrumental in the enactment of the Renunciation Act of 1783, which supplemented the legislative independence granted to Ireland in 1782. As Lord Lieutenant of Ireland, and by Royal Warrant, he created the Order of St Patrick in February 1783, with himself as the first Grand Master. He left Ireland in 1783 and again turned his attention to English politics. He enjoyed the confidence of King George III, and having opposed Fox's East India Bill, he was authorised by the King to say that "whoever voted for the India Bill was not only not his friend, but would be considered by him as an enemy", a message which ensured the defeat of the Bill. He was appointed a Secretary of State when the younger Pitt (his father's sister's son) formed his ministry in December 1783, but resigned only three days later.