Chatham Township, New Jersey incorporated as an independent borough and its former village boundaries were expanded between 1891 - 1899 with annexed portions of rural lands that had formerly been within the township. The settlement of Chatham had been established in 1710 as "John Day's Bridge" and, in 1773 when New Jersey was an English province, adopted the name of "Chatham" to honor William Pitt, 1st Earl of Chatham, a British supporter of the colonial cause. This village also had been within Morris Township and it was an active community in the Revolutionary War. On August 19, 1892, Chatham seceded from the new township
Richard Grosvenor, 1st Earl Grosvenor 1758 he declared himself in favour of the Pitt–Newcastle ministry and following this he was created Baron Grosvenor in 1761. However, when the Tory Earl of Bute became Prime Minister the following year, Grosvenor changed his allegiance. Then, when Pitt was returned to power in the Chatham Ministry of 1766–68, Grosvenor returned to support him. During the 1770s he supported Lord North during the American War of Independence. He voted against Fox's India Bill in 1783 and was rewarded by William Pitt the Younger with title of Earl Grosvenor the following year. Otherwise, Grosvenor was interested in the acquisition of