Count Toussaint-Guillaume Picquet de la Motte, also known as La Motte-Picquet was a French Navy officer and admiral. Over a career spanning 50 years, he served under Louis XV and Louis XVI and took part in 34 campaigns. He fought in the Seven Years' War and in the Naval battles of the American Revolutionary War, earning the ranks of Commandeur in the Order of Saint Louis in 1780, and of Grand Cross in 1784. He died during the French Revolution.

Diadème was the lead ship of the Diadème-class 74-gun ship of the line of the French Navy.