State Barge of Charles II
The State Barge of Charles II is a 35-foot-long (11 m) British royal barge constructed around 1670 for the use of Charles II, for events now known as fleet reviews. In January 1806 it was used to carry the coffin of Lord Nelson to St Paul's Cathedral for his state funeral.
Source: Wikipedia — State Barge of Charles II (CC BY-SA 4.0)