Antoine de Lamothe Cadillac in the context of "St. Ignace, Michigan"

Pierre Alphonse de Tonty, Alfonso de Tonti, or Alphonse de Tonty, Baron de Paludy (c. 1659 – 10 November 1727) was an officer who served under the French explorer Cadillac and helped establish the first European settlement at Detroit, Michigan, Fort Pontchartrain du Detroit on the Detroit River in 1701. Several months later, both Cadillac and Tonty brought their wives to the fort, making them the first European women to travel so deep into the new territory.

He was born in Paris, ca. 1659, to Lorenzo de Tonti who was a financier and former governor of Gaeta who was in France in exile. Lorenzo de Tonti was the inventor of the form of life insurance known as the tontine. Henri de Tonti, involved in LaSalle's exploration of the Mississippi River and the establishment of the first settlement in Arkansas, was his older brother.