Prince Octavius of Great Britain
Prince Octavius of Great Britain (23 February 1779 – 3 May 1783) was the thirteenth child and eighth son of King George III and his queen consort, Charlotte of Mecklenburg-Strelitz. Six months after the death of his younger brother Prince Alfred, Octavius was inoculated against the smallpox virus.
Source: Wikipedia — Prince Octavius of Great Britain (CC BY-SA 4.0)