14.07.1788 see Canning. In Godwin's 1796 list for 1787 Canning, and in 1794 version. George Canning has a person record in the GD website but the 1796 list entry has not been coded to it.
George Canning DNB 1770-1827 would have been 18 years old and just finished his first year at Christ Church, Oxford when Godwin saw him. The Canning in the 1796 list for 1787 may have been him or possibly his uncle Stratford Canning (QV* in Society for Constitutional Information dataset) member of SCI who died in May 1787. Perhaps Godwin was introduced to George Canning, who already enjoyed some fame as editor of the Microcosm at Eton, by Sheridan who appeared earlier in 1787 in the 1796 list