Johann Peter de Beaulieu, also Jean Pierre de Beaulieu, was a Walloon military officer. He joined the Habsburg army and fought against the Prussians during the Seven Years' War. A cultured man, he later battled Belgian rebels and earned promotion to general officer. During the French Revolutionary Wars he fought against the First French Republic and attained high command. In 1796, a young Napoleon Bonaparte won some of his first victories against an army led by Beaulieu. He retired and was the Proprietor (Inhaber) of an Austrian infantry regiment until his death.

The Battle of Millesimo, fought on 13 and 14 April 1796, was the name that Napoleon Bonaparte gave in his correspondence to one of a series of small battles that were fought in Liguria, Northern Italy between the armies of France and the allied armies of the Habsburg monarchy and of the Kingdom of Sardinia-Piedmont.