Which French admiral commanded the combined fleet at the Battle of Trafalgar?

Which French admiral commanded the combined fleet at the Battle of Trafalgar? Pierre-Charles Villeneuve commanded the combined French-Spanish fleet.

Villeneuve was a French vice admiral who led the fleet from Cádiz on 18 October 1805, under pressure to break the British blockade. Napoleon hoped the naval force could help secure control of the English Channel for a planned invasion of Britain.

The fleet comprised 33 ships of the line—18 French and 15 Spanish—and was intercepted by Vice Admiral Horatio Nelson off Cape Trafalgar on 21 October 1805. Nelson's force split the allied line into separate sections, producing a decisive British victory. Villeneuve's flagship, Bucentaure, was captured during the battle.

A common mix-up is confusing Villeneuve with Nelson, who commanded the opposing British fleet. Another is François Étienne de Rosily-Mesros, whom Napoleon had selected to replace Villeneuve but who had not yet arrived when the battle took place.